Union Butterfield 1785M High-Speed Steel Spiral Point Tap, Relieved Style, Uncoated (Bright) Finish, Round Shank With Square End, Plug Chamfer, M3-0.50 Thread Size Spiral point tap pushes chips ahead of tool to reduce clogging Spiral point with straight flutes for cutting threads in through holes Relieved-style design reduces friction between tap and workpiece for reduced tool wear Produces ANSI standard right-hand threads in metric sizes Plug chamfer for easier starting and correct perpendicular alignment