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A GREATFUL CHAMFER TOOL 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. Proper Use: This external deburring chamfer works by a way of shearing metal layer by layer. Use the lowest speed on the drill bit, and then slightly applying pressure to remove the burr. And you could use cutting oil or other lubricating oils to improve tool performance. -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 Color: Silverr Shank Type: Triangle shank Material:HSS(High Speed Steel) Fits Size: 5/16-32 bolts (.164) up to 3/4″-10 (.750) - (8mm -19mm) Package: Silver Deburring External Chamfer Tool x 2