Rite-Hite Isolator Bolts protect your boat deck from violent vibrations and collisions involving your trolling motor. Installation is easy and does not require access to the underside of the boat deck. If a bolt breaks due to impact, it can easily be replaced with a Phillips-head screwdriver. Bolts are made of rustproof stainless steel. Universal fit. 4-Pack. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Electric Trolling Motor Accessories.