Hand Tap Set Bottoming Plug Taper HSS Size #8 Finish Bright Flutes 4 General Purpose Pitch 32 Thread Type UNC Thread Length 3/4 In. Thread Length 19.050 mm Overall Length 2-1/8 In. Overall Length 53.975 mm Pitch Diameter Limits H3 Shank Dia 0.168 Standards USCTI 302 List Number 1004 For Alloy Steel Carbon Steel Free-Machining Stainless and Aluminum