1.yellow brass flat head rivet 2.surface smooth 3.size:m3-m6 4.tolerance:+/-0.01mm 5.certificate:ISO900 Material: carbon steel,stainless steel,brass,copper,aluminumCoating:zinc,nickle,silver,golden plated or as requiredTolerace:+/-0.01mmAvailable OD:2mm-20mmAvailable length:2mm-120mmPacking detail:plastic bag+carton box+wooden pallet