Provide round bar material with hole
provide steel round bar material like 4140steel we have ourown deep hole gun drill machine ,so for process hole serice faster also keep high steel material .
: Kabaide
：+8618505347032
：+8618505347032
：+8618505347032
：Aide Industry Park Daxuedong RD, Dezhou, Shandong, CHINA, 253034