... 3.Fast drilling rate 118 single tooth drilling bits / bit1.Button bit: small tooth , big tooth , conical inserts , chisel ... almost all IADC codeSizeBit Typeinchmm6152.4517, 537,617, 6376 1/2165.1517, 5377 7/8200.0517,527,547,617,627 ... ,6378 1/2215.9437,447,517,537,617,627,6379 1/2241.3437,517,537,547 ... 8437,517, 537,547,61712 1/4311.1437,517, 537,547,617,627,63717 1/2444.5517,537,617,627, ...