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At-a-glance tap drill sizing for common machine "NF" or "NC" thread series. Leaves the right amount of stock for 65% full thread. Shows the correct body size drill to use. 60 holes marked with the number size and decimal equivalent of the drill that fits each hole. Tested for accuracy. Satin finish.
2-5/16"W x 6-1/4" L x 5/64"D.
Tap size: 2-56 to 1/4 - 28.
Range: tap drill 50 to 3, body drill 44 to 1/4.
Drill gauge numbers 1 to 60, .228 to .040".