Various kind of head type Size:M1-M10mm bolt,screw,solid/semi-tubular rivet,electronic hardware,standoff,spacer,standoff,cnc turning parts.Various kinds of head typematerial:steel,ss,alloy etcfinish:zinc,nickle,black ox etc. Inner packing: Poly bag20-25kg/ carton Out packing : Carton/ palletaccording to clients' request.