These Machine Screws Feature A Phillips Panhead And Are Offered In 1/4"-20 And 5/16"-18 Sizes. They Are Made From Grade 316 Stainless Steel For Maximum Corrosion Resistance And Durability. These Screws Are Available In Small Packs And Bulk 1 Lb. Packs. Matching Washers, Nuts And Stainless Phillips Head Driver Bits Are Available.