)Place of origin:Shandong China. 2)Brand name;Jingyanggang. 3)product type:drill bits 4)tapered drill rods: a:material:50MnMo.95CrMo. b;shank size:H22กม108(7/8''กม4¼''),H25กม108(1''กม4¼''), c:length under collar:800mm1200mm.1800mm2400mm3500mm 5)integral drill rods: a:material:50MnMo.95CrMo. b;shank size:H22กม108(7/8''กม4¼''), c:length under collar:800mm1200mm.1800mm2400mm3600mm.4000mm.4400 |