Ndị na-egbu PDC
Ngwuputa coal na-eji PDC cutter
Omenala PDC tinye ndị na-egbutu
Sphere PCD bit Parabolic PDC Cut
Mkpọpu mmiri PDC Conical bọtịnụ
Mkpọpu mmanụ mmanụ PDC dome cutt
Nhọrọ diamond