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 repeatedlyWorks with both twist and brad-point drill bitsSplit-ring design positively locks anywhere along the bitWhat’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

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