Union Butterfield Straight Flute Hand Tap, General Purpose, Series: 1500A, Measurement System: Imperial, UNC Thread Standard, 1-8 Thread, Plug Chamfer, 4 Flutes, HSS, Steam Oxide, Class of Fit: 3B, Right Hand Cutting Direction, 2-1/2 in Thread Length, 5-1/8 in Overall Length, 0.8 in Shank Diameter, Steel, Stainless Steel, Copper, Titanium, Nickel, Cast Iron, Aluminum Magnesium and Synthetic Materials Material Application, H4 Thread Limit