Forster's Universal Bullet Puller works with the Forster Co-Ax® Press as well as standard loading presses with a 7/8"-14 thread and bullets from .17 caliber to .458 caliber. Carefully constructed, solid steel collets are the big difference between this bullet puller and others on the market. These collets are used with both the standard and Universal Puller. Must be used with Forster Bullet Puller Collets.