... screw with nylok; 2.Various sizes and materials; 3.High quantity&low price; 4.Rohs standard. Slotted cheese head screw:Item name ... ,copper,etc; Surface Treatment: natural,zinc plated,chorme plated,nickel plated,brass plated,nylok;Head Type: Flat head,dome head,cheese head,etc;Standard: JIS,BS,BA,GB ...