Alvord Polk 661-2 High-Speed Steel Repairman's Deburring Reamer, Left Hand Spiral Flute, Brace Shank, Uncoated Finish, 3/16 Inch Point Diameter, 1-1/4 Inch Large End Diameter Left-hand spiral reamers are good for use in through holes (holes that extend all the way through a workpiece), as they push chips ahead of the tool and into the hole Spiral flute reamers are recommended for reaming holes with interruptions, as they prevent damage to the workpiece edge and tool Brace shank tools have a tapered square profile, which most toolholders can grasp efficiently and without slipping as much as round shanks Uncoated (bright) tools have no finish or coating. They are a good choice for general purpose applications High-speed steel is a common general purpose steel for cutting tools, is compatible with a variety of materials, and tends to be lower in price than cobalt steel or carbide