... /8",6",6 1/2",7 1/2",7 7/8",8 1/2",9 1/2",9 5/8",9 7/8",12 1/4",14 3/4",17 1 ... Tricone Bit3 7/8 ,5 1/2, 6 1/27 7/8,8 1/2,8 3/410 5/8,12 1/413 3/4, 17 1/2,22, 24 ... Tricone Bit3 7/8 ,5 1/2, 6 1/27 7/8,8 1/2,8 3/410 5/8,12 1/413 3/4, 17 1/2,22, 24 ... letter 1st number is the series. 1 to 3 represent a milled tooth tri cones, 4 – 8 represent TCI tri cones. The higher ...