... , with the excellent wear-ability and impact toughness of the PDC. It has a useful life, high ... speed,big drainageHenan zhongmei can supply all kinds of PDC Coring and non-coring bits, PDC ... different diameter of 2-wings drag bit, 3-wings drag bit, 4-wings drag bit, and 6-wings drag bit. ... alloy steel and PDC cutter insert, plus state of art welding technology and multiple precision heat treatment ...