Union Butterfield 4535 High-Speed Steel Chucking Reamer, Right Hand Spiral Flute, Round Shank, Uncoated (Bright), 3/32 inch Spiral construction protects interrupted cuts by preventing whole-flute contact with the leading edge of the interruption Right-hand spiral pulls chips away from the tip of the tool to prevent clogging in blind holes High-speed steel is compatible with a variety of materials Uncoated (bright) tools have no additional surface treatment or coating for use on a broad range of materials 45-degree bevel at the cutting tip facilitates entry to pre-drilled holes