1 PDC concave drill bit/PDC FULL FACE DRILL BIT 2 Standard size:56,65,75,94,113,133,153mm ... 3 High efficiency, long life PDC concave drill bit/PDC FULL FACE DRILL BITSteel body PDC bits/PDC drill ... design as per clients’ drawings/samples/requirements. PDC concave drill bit/PDC FULL FACE DRILL ...