China HSS4341 Rolling Titanium HRC60-631.5-2.0-2.5-3.0-3.2-3.5-4.0-4.5-5.0-6.0-8.0mmlga Tested 11 PCS Drill Bit Set, Find details about China Drills, Drill Bits Set from HSS4341 Rolling Titanium HRC60-631.5-2.0-2.5-3.0-3.2-3.5-4.0-4.5-5.0-6.0-8.0mmlga Tested 11 PCS Drill Bit Set