... Plain Cap Diameter9# x 2-1/2,2,3Twisted or Plain 20mm10# x 2-1/2,2Twisted or Plain 20mm12# x 2,1-1/2Twisted or ... Plain 18mm13# x 1-3/4,2,1-1/2Twisted or Plain 15mmFinish : Electro Galvanized, Hot-Dip ... washers, lock washers, structural Washers. square washer, bowl washer.Screws: machine screws, self tapping screws, self drilling screws, set screws, hex ...