# Sandbox.PhysicsBodyBuilder.SetBoneName

```csharp
PhysicsBodyBuilder SetBoneName(string boneName)
```

### Parameters

- `boneName` (`string`): The attached bone name, or null to detach it.

### Returns

`PhysicsBodyBuilder`

Declared in [Sandbox.PhysicsBodyBuilder](/api/Sandbox.PhysicsBodyBuilder).
Assembly: `Sandbox.Engine`.