All brass made, rust-free,washer and grommets,self pierceing.0#,1#,2#,3# available. 500 set ... per inner box. All brass made, rust-free,washer and grommets,self pierceing.0#,1#,2#,3# available. 500 set ... .4mmGBY-0(3#)2450.5*39*382424.6mm11.9mm Grommets and Washer Sets