... 8.8,9.8... ..... Copper MACHINE SCREW, brass shoulder bolt screw ,BRASS ALLEN SCREW. A good non-standard fastenerS manufacturer ... is SS201,202,302,304,316...copper is shiny brass , pure copper,such as H62,H65,H68... ... ,Pan head,Countersunk head,Bugle head,Oval head,Hex flange head,Round head,Ball head,Button head ... with more than 20 years experiences in screw,bolt,nut,washer,rivet, stud, pin,wrench and so ...