We are professional supplier of rock bits and pdc bits Size: 3"--26" Material: Alloy steel Certificated by API&ISO9001:2008 New PDC Bits(12-1/4") Description about sell rock bits,tricone bits, diamond bits,PDC bits,TCI bits, steel tooth bits, milled tooth bits, rock bits, oilfield bits and so on .Specification: diameter from 5-1/8” to 13-1/2”.There are different PDC (polycrystalline diamond ...