... material: steel, 3. finish: zinc non-standard flat head socket rivets with internal thread1.Standards:DIN ,ANSI/ASME,BS,GB,JIS ... bolt, non-standard nut, non-standard screws, egg neck bolt, fishbolt, countersunk head bolt. Expansion bolt, expansion screw.etc. ... operation team. We produce "Jinrui" brand standard parts with the corporate philosophy of "creating first class enterprise andmanufacturing ...