Pittsburg Alleghany® Tap and Drill Set, 18 Piece, Drill Sizes: #36, #29, #25, #21, #7, F, 5/16", U, & 27/64", Tap Sizes: #6-32, #8-32, #10-24, #10-32, 1/4-20, 5/16", 3/8-16, 7/16-14, 1/2-13, Coarse Pitch, Material: High Speed Steel, Includes: Huot Index, Features: Sets Match 9 Taps with Correct Tap Drill, Jobber Length Drills are Polished Flute Ground from the Solid