diff --git a/api/src/model/entitites/cylinder.entity.ts b/api/src/model/entitites/cylinder.entity.ts
index 69679d9..590c6ca 100644
--- a/api/src/model/entitites/cylinder.entity.ts
+++ b/api/src/model/entitites/cylinder.entity.ts
@@ -23,6 +23,10 @@ export class Cylinder {
   @Column({ name:'description', type: 'text', nullable: true })
   description: string;
 
+  @Column({name: 'is_digital', type: 'boolean', default: false})
+  isDigital: boolean;
+
+
   @ManyToMany(() => Key, (key) => key.cylinder, { onDelete: 'NO ACTION'})
   keys: Key[];
 
diff --git a/client/src/app/modules/cylinder/components/create-cylinder/create-cylinder.component.html b/client/src/app/modules/cylinder/components/create-cylinder/create-cylinder.component.html
index 792cdbf..312a096 100644
--- a/client/src/app/modules/cylinder/components/create-cylinder/create-cylinder.component.html
+++ b/client/src/app/modules/cylinder/components/create-cylinder/create-cylinder.component.html
@@ -1,10 +1,11 @@
 <h2 mat-dialog-title>Neuen Zylinder anlegen</h2>
 <mat-dialog-content>
+  <div class="mat-body" style="margin-bottom: 24px;">Hier können Zylinder angelegt werden. Jeder Zylinder muss genau einer Schließanlage zugeordnet werden. Es können mehrere Schlüssel zu einem Zylinder zugeordnet werden.</div>
     <form [formGroup]="createForm" class="flex flex-col gap-3">
 
         <mat-form-field>
             <mat-label>Name</mat-label>
-            <input type="text" matInput formControlName="name" maxlength="100">
+            <input type="text" matInput formControlName="name" maxlength="100" placeholder="Bsp.: Haustür Ferienhaus">
             @if ((createForm.controls.name.value || '').length > 20) {
                 <mat-hint>{{ (createForm.controls.name.value || '').length }} / 100 Zeichen</mat-hint>
             } @else {
@@ -12,11 +13,16 @@
             }
         </mat-form-field>
 
-        <mat-form-field>
-            <mat-label>Beschreibung</mat-label>
-            <input type="text" matInput formControlName="description" maxlength="255">
-              <mat-hint>Zylinderlänge und co.</mat-hint>
-        </mat-form-field>
+        <div class="flex items-center gap-6">
+          <mat-form-field  class="flex-auto">
+              <mat-label>Beschreibung</mat-label>
+              <input type="text" matInput formControlName="description" maxlength="255" placeholder="Bsp.: 30/30">
+                <mat-hint>Zylinderlänge und co.</mat-hint>
+          </mat-form-field>
+
+          <mat-checkbox formControlName="isDigital">Digitales Schloss</mat-checkbox>
+        </div>
+
 
         
         <mat-form-field>
@@ -27,9 +33,11 @@
                 }
             </mat-select>
             <mat-hint>Zu welcher Schließanlage gehört der Zylinder?</mat-hint>
-            <mat-progress-bar mode="indeterminate" *ngIf="isLoading"></mat-progress-bar>
+            @if (isLoading) {
+              <mat-progress-bar mode="indeterminate"></mat-progress-bar>
+            }
+            
         </mat-form-field>
-
     </form>
 </mat-dialog-content>
 <mat-dialog-actions>
diff --git a/client/src/app/modules/cylinder/components/create-cylinder/create-cylinder.component.ts b/client/src/app/modules/cylinder/components/create-cylinder/create-cylinder.component.ts
index 3971823..6d8e1cc 100644
--- a/client/src/app/modules/cylinder/components/create-cylinder/create-cylinder.component.ts
+++ b/client/src/app/modules/cylinder/components/create-cylinder/create-cylinder.component.ts
@@ -11,10 +11,11 @@ import { MatButtonModule } from '@angular/material/button';
 import { MatIconModule } from '@angular/material/icon';
 import { MatProgressBarModule } from '@angular/material/progress-bar';
 import { CommonModule } from '@angular/common';
+import { MatCheckboxModule } from '@angular/material/checkbox';
 
 @Component({
     selector: 'app-create-cylinder',
-    imports: [MatFormFieldModule, MatInputModule, MatDialogModule, ReactiveFormsModule, FormsModule, MatSelectModule, MatButtonModule, MatIconModule, MatProgressBarModule, CommonModule],
+    imports: [MatFormFieldModule, MatInputModule, MatDialogModule, ReactiveFormsModule, FormsModule, MatSelectModule, MatButtonModule, MatIconModule, MatProgressBarModule, CommonModule, MatCheckboxModule],
     templateUrl: './create-cylinder.component.html',
     styleUrl: './create-cylinder.component.scss'
 })
@@ -29,7 +30,8 @@ export class CreateCylinderComponent {
   createForm = new FormGroup({
     name: new FormControl<string | null>(null, Validators.required),
     system: new FormControl<any>(null, Validators.required),
-    description: new FormControl<string | null>(null)
+    description: new FormControl<string | null>(null),
+    isDigital: new FormControl<boolean>(false)
   });
 
   ngOnInit() {
diff --git a/client/src/app/modules/cylinder/cylinder.component.ts b/client/src/app/modules/cylinder/cylinder.component.ts
index e4c1d50..7785353 100644
--- a/client/src/app/modules/cylinder/cylinder.component.ts
+++ b/client/src/app/modules/cylinder/cylinder.component.ts
@@ -12,6 +12,7 @@ import { MatButtonModule } from '@angular/material/button';
 import { AgGridContainerComponent } from '../../shared/ag-grid/components/ag-grid-container/ag-grid-container.component';
 import { CylinderArchiveComponent } from './components/cylinder-archive/cylinder-archive.component';
 import { ICylinder } from '../../model/interface/cylinder.interface';
+import { DialogPosition } from '@angular/material/dialog'
 
 @Component({
     selector: 'app-cylinder',
@@ -77,10 +78,10 @@ export class CylinderComponent extends AgGridContainerComponent {
 
   openCreateCylinder() {
     this.dialog.open(CreateCylinderComponent, {
-      maxWidth: "calc(100vw - 24px)",
-      width: "30vw",
+      maxWidth: "calc(100vw - 48px)",
+      width: "800px",
       minWidth: "200px",
-      disableClose: true
+      disableClose: true,
     }).afterClosed().subscribe({
       next: (cylinder) => {
         if (cylinder) {
@@ -92,9 +93,9 @@ export class CylinderComponent extends AgGridContainerComponent {
 
   openArchive() {
     this.dialog.open(CylinderArchiveComponent, {
-      maxHeight: "calc(100vh - 24px)",
-      maxWidth: "calc(100vw - 24px)",
-      width: "50vw",
+      maxHeight: "calc(100vh - 48px)",
+      maxWidth: "calc(100vw - 48px)",
+      width: "800px",
       minWidth: "min(700px,calc(100vw - 24px))",
       height: "70vh",
     })
diff --git a/client/src/app/modules/keys/create/create.component.html b/client/src/app/modules/keys/create/create.component.html
index a11f89d..21fa43d 100644
--- a/client/src/app/modules/keys/create/create.component.html
+++ b/client/src/app/modules/keys/create/create.component.html
@@ -4,19 +4,19 @@
 
     <mat-form-field>
       <mat-label>Name</mat-label>
-      <input type="text" matInput formControlName="name" maxlength="100">
+      <input type="text" matInput formControlName="name" maxlength="100" placeholder="Bsp.: Kellerschlüssel Ferienhaus">
       @if ((createForm.controls.name.value || '').length > 20) {
         <mat-hint>{{ (createForm.controls.name.value || '').length }} / 100 Zeichen</mat-hint>
       } @else {
-        <mat-hint>Wie soll der Schlüssel heißen?</mat-hint>
+        <mat-hint>Wie soll der Schlüssel heißen? Der Name beschreibt den Schlüssel. Er sollte aber nicht einem Mieter zugeordnet werden.</mat-hint>
       }
     </mat-form-field>
 
     <div class="flex items-center gap-6">
       <mat-form-field class="flex-auto">
         <mat-label>Schlüsselnummer</mat-label>
-        <input type="text" matInput formControlName="nr"  maxlength="100">
-        <mat-hint>Nummer auf dem Schlüssel</mat-hint>
+        <input type="text" matInput formControlName="nr"  maxlength="100" placeholder="12 - R115843">
+        <mat-hint>Die Nummer auf dem Schlüssel oder dem Chip.</mat-hint>
       </mat-form-field>
   
       <div>
diff --git a/client/src/app/modules/keys/create/create.component.ts b/client/src/app/modules/keys/create/create.component.ts
index e00c0fb..c94e527 100644
--- a/client/src/app/modules/keys/create/create.component.ts
+++ b/client/src/app/modules/keys/create/create.component.ts
@@ -93,9 +93,9 @@ export class CreateKeyComponent {
 
   openSelectMultipleCylinders() {
     this.dialog.open(SelectKeyCylinderComponent, {
-      maxHeight: "calc(100vh - 24px)",
-      maxWidth: "calc(100vw - 24px)",
-      width: "50vw",
+      maxHeight: "calc(100vh - 48px)",
+      maxWidth: "calc(100vw - 48px)",
+      width: "800px",
       minWidth: "300px",
       height: "70vh",
       disableClose: true,
diff --git a/client/src/app/modules/keys/keys.component.ts b/client/src/app/modules/keys/keys.component.ts
index 2b3723c..209083a 100644
--- a/client/src/app/modules/keys/keys.component.ts
+++ b/client/src/app/modules/keys/keys.component.ts
@@ -170,8 +170,8 @@ export class KeysComponent extends AgGridContainerComponent {
 
   openCreateKey() {
     this.dialog.open(CreateKeyComponent, {
-      maxWidth: "calc(100vw - 24px)",
-      width: "30vw",
+      maxWidth: "calc(100vw - 48px)",
+      width: "800px",
       minWidth: "200px",
       disableClose: true
     }).afterClosed().subscribe({
@@ -193,8 +193,8 @@ export class KeysComponent extends AgGridContainerComponent {
     this.gridApi.setGridOption('loading', false)
     const ref = this.dialog.open(SelectKeyCylinderComponent, {
       data: cylinders,
-      maxHeight: "calc(100vh - 24px)",
-      maxWidth: "calc(100vw - 24px)",
+      maxHeight: "calc(100vh - 48px)",
+      maxWidth: "calc(100vw - 48px)",
       width: "50vw",
       minWidth: "300px",
       height: "70vh",