Shakespeare Style 408-RUPPER BRACKET WHITE MOLDED PLASTICInsulated stand-off bracket of white molded plastic. Corrosion resistant. Easy-open for quick laydown. For use with Styles 81-S and 407 Swivel Mounts and antennas of 1″ (using insert provided) or1-1/2″ diameter. Now includes a new 1-1/8″ insert! Specifications:Type: Mounting BracketsBox Dimensions: 1″H x 6″W x 6″L WT: 0.6 lbsUPC: 719441110796Quick Guide (pdf)