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A great device for deburring the edge of cylindrical objects, remove the burr, makes it so much easier to start nuts after cutting a bolt or threaded rod. with this Deburring External Chamfer Tool for Drill Bit, you can quickly Repairs damaged bolts and tightens the nuts in place, saving you time and money, very practical in the daily life. - Made of high quality stainless steel, high hardness and effective on stainless steel, hardened steel, mild steel, copper, brass, aluminum, fiberglass, wood, plastic, no matter it is with or without screw thread. -Universally compatible with all kinds of drills and chucks to remove burrs without hurting your hands - Keep in mind also that you don't have to shave a lot off the bolt, just enough to take the burrs off. - Easier than using a simple scraper tool, avoids the random divots when doing it by hand How to use? 1. Attach the deburring external chamfer tool to the end of your power drill 2. Using the lowest speed on the drill bit and then applying pressure slightly to remove the burr. Specification: Fit size: 8-32 bolts (.164) up to 3/4″-10 (.750) - (4mm -19mm) Size(approx.):inner ring diameter 22mm/0.87",outer ring diameter 28mm/1.10" Interior ring diameter: 22mm Exterior ring diameter: 28mm Package content 1*Triangle Shank Burr Remover 2*Hex Shank Burr Remover