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Feature: The role of the limit ring: Mainly used to fix the drill bit, limit the depth of the drill hole, so that the depth of the hole can be consistent, more convenient use of round tenon. Item type: drill bit depth stop sleeve Material: steelWeight: about 60g Size: (mm/inch)3mm 4mm 5mm 6mm 8mm 10mm 12mm 16mm Specifications Inner hole Outer diameter Height 3/0.12 3/0.12 10/0.39 8/0.31 4/0.16 4/0.16 10/0.39 8/0.31 5/0.20 5/0.20 12/0.47 8/0.31 6/0.24 6/0.24 12/0.47 8/0.31 8/0.31 8/0.31 16/0.63 8/0.31 10/0.39 10/0.39 18/0.71 8/0.31 12/0.47 12/0.47 20/0.79 8/0.31 16/0.63 16/0.63 22/0.87 9/0.35