Drill bit stop collars are used to prevent over/under drilling for consistent hole depths when drilling repeatedly. The Drill Bit Stop Collars in this seven-piece set feature two design types. The five larger sizes are a split-ring design, and the two smaller ones are a set screw design. The split-ring design will positively lock anywhere along the bit diameter and will not move after tightening. This set will work on both twist and brad-point drill bits, includes a hex key and the following sizes: 1/8", 3/16", 1/4", 5/16", 3/8", 7/16" and 1/2".Features: Used to prevent over/under drilling for consistent hole depths when drilling repeatedly Works with both twist and brad-point drill bits Split-ring design positively locks anywhere along the bit What's Included: (1) 1/8" drill bit stop collar with set screw (1) 3/16" drill bit stop collar with set screw (1) 1/4" drill bit stop collar with split ring (1) 5/16" drill bit stop collar with split ring (1) 3/8" drill bit stop collar with split ring (1) 7/16" drill bit stop collar with split ring (1) 1/2" drill bit stop collar with split ring (1) Hex key
