Champion 18 Piece NF Tap and Drill Set. XL5 Drills and XL22 NF Taps. Taps: 6-40, 8-36,10-32,12-28, 1/4-28, 5/16-24, 3/8-24, 7/16-20, 1/2-20, Drills: #33, #29, # 21, #15, #3,I, Q, 25/64, 29/64.