Dormer Spiral Point Tap, Series: E026 MTT-X, Measurement System: Imperial, UNC Thread Standard, 1/4-20 Thread, Plug Chamfer, 3 Flutes, HSS-E-PM, Steam Oxide, Class of Fit: 3B, Right Hand Cutting Direction, 0.507 in Thread Length, 2-1/2 in Overall Length, 0.255 in Shank Diameter, Steel, Stainless Steel and Cast Iron Material Application, H3 Thread Limit