Silicon bronze is used primarily in marine environments. standards: ansi, bs, din, jis etc.\n\nspecifications: head type: flat head, oval head, round head etc. drive type: phillips, square, slotted, phillips /slotted, pozi etc. diameter: #4 - 3 /4” length: 1/4" - 6", features: material: silicon bronze, surface finish: self colour, inner packing: ploybag or as customers' requests, outer packing: carton or as customers' requests.\n