... for medium to medium-hard formation. PDC bit, diamond bit, PDC core bit, PDC bits1. Circular arc brown, ... cutterDrilling formation(PDC flat face non-core bit)Detailed Product Description PDC material cutters supper ... ,113,133,153PDC bit,diamond bit,flat face non-coring PDC bit,PDC Concave Bit,PDC bits1.Different ... to make force balance to drill a precise round hole.3.Large junk slots and flushing ports ...