Contains 100 fully-galvanized 1.25 inch washers with tabs and 100 rust-free 1 5/8 inch screws for securing HYDRO-BLOK wallboard and accessories. Screws come with self-tapping head for both metal and wood studs. Specialty screw head allows for use with either #2 Phillips or #2 Robertson screwdriver bits. Washers must be secured with HYDRO-BLOK Wallboard screws. HYDRO-BLOK Wallboard Washers and Screws are also available individually in 1000 pc buckets.