Tough plies of fabric impregnated rubber pads are compressed and secured by 3/4 thick steel rods and mounted to 1/4 thick angle iron brackets. Absorbs over 80% of the impact force. Pre-drilled 13/16 anchor bolt holes offer quick installation. Allow 12 between each bumper for dependable protection.Specifications. Color: Black. Construction: Rubber. Mount Type: Welded or Bolted to Surface. Assembly: Assembled. Dimension: 36 W x 4.5 D x 10 H. Weight: 68 lbsFeatures. Dock Bumper