Union Butterfield® Straight Flute Hand Tap, General Purpose, Series: 1500, Measurement System: Imperial, UNC Thread Standard, 1/4-20 Thread, Tapered Chamfer, 4 Flutes, HSS, Bright, Class of Fit: 2B/3B, Right Hand Cutting Direction, 1 in Thread Length, 2-1/2 in Overall Length, 0.255 in Shank Diameter, Steel, Stainless Steel, Copper, Titanium, Nickel, Cast Iron, Aluminum Magnesium and Synthetic Materials Material Application, H3 Thread Limit