Standard Pack = 1 piece(s). Tap Size = 1/4 inch ; TPI / Pitch = 20 ; Tap Style = Forming ; Thread Type = UNC ; Thread Limit = H9 ; Chamfer = 2.5P ; Material = HSS-CO ; Coating = TiCN ; Overall Length = 2-1/2 inch ; Thread Length = 1 inch ; Shank Diameter = 0.255 inch ; Square Size = 0.191 inch ; Coolant Thru = No ; Length = 3 ; Width = 0.4 ; Height = 0.35 ;