OSG Straight Flute Hand Tap, General Purpose, Series: 101, Measurement System: Imperial, UNC Thread, 3/8-16 Thread, Plug Chamfer, 4 Flutes, HSS, Steam Oxide, Right Hand Cutting, 1-1/4 in Thread Length, 2-15/16 in Overall Length, 0.381 in Shank Dia, 1-1/2 in Shank Length, Material Application: Aluminum, Cast Aluminum, Cast Iron, High Carbon Steel, Low Carbon Steel and Medium Carbon Steel, H3 Thread Limit, Through Coolant: No