Fits large diameter tubing-up to 2-1/2" O.D. Material: low carbon steel Plain finish Size: 6-1/2 x 3-7/8" thickness: 3/16" Hole size: for 3/8" bolt Weight: 1.35lb.-1piece, 5.26lb.-4pcs Package list: 4 x Heavy Roll Cage Base Plate Bolt not included