These stop collars are specially designed to fit our Fuller Tapered Drill Countersink. They fit the countersink portion of the drill bit and limit the depth of the countersink drilled into the workpiece. These thin, low-profile stop collars allow maximum use of the countersink bit without interference. The 3/8 inch stop collar fits 5-9 Tapered Drill Countersinks and the 1/2 inch stop collar fits 10 & 12.








