... and materials; 3.high quantity&low price; 4.Rohs standard. .Hexagonal head nylock screw:Item name: hex head nylock screw;Material ... : stainless steel,iron,carbon steel,aluminum,brass,copper Surface Treatment: natural,zinc plated,chorme plated,nickel ... plated,brass platedStandard: JIS,BS,GB,ISO,DIN,ISO,AISI Size: ...