Titan USA Hand Tap Set, Standard Straight Flute, Series: 728, Measurement System: Imperial, 3 Piece, 1/4-28, Ground, 1 in Thread Length, 2-1/2 in Overall Length, 4 Flutes, Right Hand Cutting, 0.255 in Shank Dia, Taper/Plug/Bottoming Chamfer, H3 Thread Limit, 0.191 in Square Size, HSS, Uncoated