---
title: thumbKnuckle
framework: realitykit
role: symbol
role_heading: Type Property
path: realitykit/anchoringcomponent/target-swift.enum/handlocation/handjoint/thumbknuckle
---

# thumbKnuckle

An anchor location at the knuckle of the thumb.

## Declaration

```swift
static let thumbKnuckle: AnchoringComponent.Target.HandLocation.HandJoint
```

## Discussion

Discussion Content anchored this way has its positive y-axis in the direction of the fingernail’s normal and its negative z-axis pointing towards the side where the index finger is.