Titan USA Hand Tap Set, Standard Straight Flute, Series: 728, Measurement System: Imperial, 3 Piece, 1/4-20 Size, Ground Thread Standard, 1 in Thread Length, 2-1/2 in Overall Length, 4 Flutes, Right Hand Cutting Direction, 0.255 in Shank Diameter, Taper/Plug/Bottoming Chamfer, H3 Thread Limit, 0.191 in Square, HSS, Uncoated