The Hornady Cam-Lock Bullet Puller is one of the fastest and easiest ways to pull bullets with a reloading press. Collets are the part of the system that clamp to the bullet so it can be removed quickly and easily. This is just the Collet.
Specifications:

Type	Collet
Caliber	308/312
Size	For Use With .308 Diameters
Quantity	1
Weight	.8 oz
Function
Compatible With	Cam-Lock Bullet Puller
Material
Includes
Capacity
Media Capacity
Finish
Grain
Media Type
Micrometer Type