Union Butterfield Spiral Point Machine Tap, High Performance, Series: 1672AP Applix MXP, Measurement System: Imperial, UNC, 5/16-18, Plug Chamfer, 3 Flutes, HSS, TiCN Coated, Class of Fit: 2B, Right Hand Cutting, 0.787 in Thread Length, 3.543 in Overall Length, 0.318 in Shank Dia, Steel, Stainless Steel, Titanium, Nickel, Copper and Aluminum Magnesium Material Application, H5 Thread Limit