Drill Bit Stop Collars-7-Piece Set
These stop collars feature the "split-ring" design which positively locks anywhere along the bit diameter. They work on both standard and brad-point bits. Unlike setscrew type collars that may skew or damage the bit, these units will not move after tightening. The set includes a hex key and 1/8", 3/16", 1/4", 5/16", 3/8", 7/16", and 1/2" stop collars.