Dormer E550 High-Speed Steel Pipe Tap, BSPT, Uncoated (Bright) Finish, Round Shank With Square End, Modified Bottoming Chamfer, 1/8"-28 Thread Size Pipe tap cuts threads in pipes and pipe fittings Straight flutes for cutting threads in through holes and blind holes Produces British Standard Pipe Taper (BSPT) threads for tighter seals than straight threads High-speed steel is compatible with a variety of materials Modified bottoming chamfer has additional length to reduce chip load, add tool life, and permit higher tapping speeds