RDS Dock Hardware 1-1/2" Circular Clamp on Brace Bracket Used in the same manner as our Brace Bracket but clamps over the outside of the 1.5" ID (2" OD) pipe for easier installation. Universal swivel accepts 1/2" ID pipe Use 1/2" ID (app. 3/4" OD) cross pipe. Length as required, based on width of dock and water depth. 3/8" S. S. assembly bolts included. Additional stainless steel hardware is available in our Dock Accessories Section solid cast aluminum manufactured in the United States with USA alloys