OSG Spiral Point Gun Tap, Series: 105, Measurement System: Imperial, UNF, 5/16-24, Plug Chamfer, 2 Flutes, HSS, Bright, Right Hand Cutting, 1-1/8 in Thread Length, 2-23/32 in Overall Length, 0.318 in Shank Dia, Aluminum, Carbon Steel and Cast Iron Material Application, H3 Thread Limit