1)design yo drill with optimum effeciency and with minimum vibrations. 2)high strength and toughness 3)used in oil explorati 1) supply new and junk drill bits,pdc bits,tci bits,tricone bits,rock bits.2)steel tooth bits,drill pipe,scrap drill bits,junk drill bits,scrap tricone bits,junk tricone rock bits,new rock bits,scrap pdc drill bits, rerun steel tooth bits,surplus stabilizers,used drill bits ...