Union Butterfield TN1534(UNC) High-Speed Steel Spiral Point Tap, Relieved Style, TiN Coated, Round Shank With Square End, Plug Chamfer, 12-24 Thread Size Spiral point tap pushes chips ahead of tool to reduce clogging Spiral point tap with straight flutes for cutting threads in through holes Titanium nitride (TiN) coating combines hardness with low friction for extended tool life and faster cutting Relieved-style design with eccentric, full-pitch diameter thread relief for free cutting and reduced tool wear Plug chamfer for easier starting and correct perpendicular alignment