Plug Chamfer - National Coarse Fractional Machine Screw Sizes in a Index Case.  18 Pc. High Speed Steel 135° Split Point Gold & Black Drills & High Speed Steel Gold & Black NC Taps

Tap Sizes: 6-32, 8-32, 10-24, 12-24, 1/4-20, 5/16-18, 3/8-16, 7/16-14, 1/2-13 Drill Sizes: #36, #29, #25, #16, #7, F, 5/16, U, 27/64