Set of 7 collars sizes: 1/8in, 3/16in, 1/4in, 5/16in, 3/8in, 7/16in & 1/2in.
Features collars with set screws which lock into the drill flute or bit surface.
Surface finish either zinc-plated, or black oxide to prevent rusting.
WARNING: Cancer and Reproductive Harm—www.P65Warnings.ca.gov