pMorse Spiral Point Tap, High Performance, Series 2088, Measurement System Imperial, UNC, 91612, Plug Chamfer, 4 Flutes, HSSPM, Black Steam Oxide, Right Hand Cutting, 1024 in Thread Length, 4331 in Overall Length, Steel, Steel Alloy, Stainless Steel, Titanium Alloy and Materials up to 36Rc Hardness Material Applicationp.