Collars won't wobble, nick or damage the drill bit
Easy to adjust
Drill and Tool Stop Collars fasten onto the flutes of drill bits and permit accurate, repeatable hole drilling without damaging the bit. Capable of holding their position better than set-screw types, these one-piece, clamp-type collars won't wobble and nick or damage the edge of the drill bit. Sets include an assortment of popular sizes.
Stafford Manufacturing Corp.