The Hornady Bullet Collet is intended to be used with the Cam Lock Bullet Puller.

The Cam Lock Bullet puller is the fastest, easiest way to pull bullets with your press. Just clamp on the bullet, pull down on the handle and the bullet is removed.

Specifications and Features: Hornady Bullet Collet .277 Diameter For use with Cam Lock Bullet Puller

Works with the Cam Lock Bullet Puller. The fastest, easiest way to pull bullets with your press.

Just clamp on the bullet, pull down on the handle and the bullet is removed. Intended for rifle cartridges only.

https://www.hornady.com/reloading/presses/lock-n-load-accessories/bullet-pullers-bullet-collets/#!/