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Whether for home, farm, builder or industrial customers, National has all the right hardware in the sizes and finishes you need. With over a century of service National is committed to maintaining the highest level of product quality, innovation and manufacturing technology.Easy to use,Welded-on mounting brackets create single-step easy installation to building side with lag screws,Mounting brackets are welded to the rail at 2 ft. centers,Manufactured from hot rolled steel,Meets ANSI/BHMA A156.14, grade 2,Ribbed design for extra strength,For security, all screws are concealed when hasp is closed