Tap Tap Style Straight Flute (Hand) Tap Dimension Type Inch Tap Thread Size 1/4 In.-20 Tap Chamfer Plug Number of Flutes 4 Pitch Diameter Limit H3 Tap Material High Speed Steel Tap Finish Nitride/Oxide Tap Thread Type UNC Right Hand Thread Length 1 In. Shank Dia 0.255 In. Overall Length 2-1/2 In. Number of Pieces 1California proposition 65 warning