1)Spotting drill bits,cutting tools 2)Size:3mm-20mm 3)Material:carbide,hss 4) ... :90/120 degree Spotting drill bits,drill bits,drilling tools,cutting tools Feature 1.Size:standard 3mm-20mm or as requrie2 ... Hard Steels,Ductile Cast Iron,Mold Steels,Aluminum.6.Mainly used for the hole processing prefabricated accurate location, guide the twist ...