Holders for small caps (3/16", 9/32", and 3/8" diameters) have 1/8" shank. Holders for large caps (1/2" and 5/8" diameters) have 1/4" shank.
Choose holder to match the size and shape of the Abrasive Cap (sold separately) Caps and holders are designed for easy mounting and removal.
Caps are held securely by centrifugal force while working.