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".

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