Spiral Point Tap Right Hand Tap Style Plug Size 1/4 In. Pitch 28 Material High Vanadium High Speed Steel-E Black Oxide Finish Overall Length 2-1/2 In. Thread Length 19/32 In. Shank Dia 0.255 In. Number of Flutes 3 Thread Type UNF Pitch Diameter Limits H3 List Number 8301 Standards ANSI