... and functions of Three Wing Cove Compact PDC Mining Bit 1, bit long life: to diamond compact give priority to cutting tooth, ... 4 ~ 5 times;2, high drilling efficiency: diamond exposed big (composite polycrystalline layer almost all exposed), bit can always stay ... , gauge effect is good: my company compact bit inside and outside can Mosaic diamond polycrystalline gauge, wear resistance is strong, gauge ...