Solar Fixings Hardware Solar Panel Bi-Metal Screw SINOAN Article Number:FS60032001 Brand Name:DRILLMAN OR OEM Material:Stainless carbon +Steel Surface:Ruspert Type:Tapping Product Details Solar Panel Bi-Metal Tapping ScrewBi- metal technology – 304 stainless steel body plus carbon steel point. Excellent corrosion resistance and longer cycle of usage lifespan. High strength, ductility, and reliability.