Smith-Victor Three-Roll Paper Rack Bracket 401261 Keep three rolls of background paper ready to go with this pair of Paper Rack Brackets. For use with Smith-Victor Grande and EconomyBackground Paper Racks, these solid steel brackets fit over the 3/8" stud on your light stands. The 3/8" studs on each end of the bracket will fit the Economy or Grande BPR crossbars, sold separately. Brackets are 2 inches wide; 9 inches long. Studs are 2.5 inches tall; 3/8 inch dia. Steel is 5/16 inches thick. Weight of pair: 2.75 pounds.