... ,DIN,ANSI,JIS,GB 4.OEM is welcom big truss head rivetspecification1.material:carbon/stainless steel,brass or as per customer ... 's requirement2.surface treatment:zinc plating,nickle plating,nigrescence,chrome plating etc.3.heat treatment:point hardening,quenching hardening4.OEM ... ,length,material and standard as your drawings and samples. aluminum mushroom head rivet