STOP COLLARS HELP CONTROL DRILLING DEPTH

Black oxide steel stop collars use hex screws (wrenches included) that tighten the collar around the bit, rather than locking into the flutes, so they are less likely to damage the drill bit flutes:

Especially helpful when used with dowelling jigs and other boring fixtures where uniform hole depth is a requirement.

Seven-piece standard set has collars to fit 1/8", 3/16", 1/4", 5/16", 3/8", 7/16" and 1/2" drill bits.

Imported.