Hand Tap Set Bottoming Plug Taper HSS Size 1/2 Finish Bright Flutes 4 General Purpose Pitch 20 Thread Type UNF Thread Length 1-21/32 In. Thread Length 42.067 mm Overall Length 3-3/8 In. Overall Length 85.725 mm Pitch Diameter Limits H3 Shank Dia 0.367 Standards USCTI 302 List Number 1004 For Alloy Steel Carbon Steel Free-Machining Stainless and Aluminum