1 5/16x2-1/2hxslv anchor. Designed for medium and heavy weight fastening of solid type materials. Zinc-plated. Size: 5/16" x 2-1/2", hexnut No. 11281: Size: 3/8" x 3", hexnut No. 50116: Size: 1/2" x 2-1/4", hexnut No. 11283: Size: 1/2" x 3", hexnut No. 11285: Size: 1/2" x 4", hexnut No. 50120: Size: 5/8" x 6" No. 50119: Size: 5/8" x 4-1/4"