Trailer bunk slides provide a low friction alternative to rollers. these slides make the boat ramp a breeze with a simple solution to an age old hassle. fabricated from king starboard, these slides are designed to be durable and withstand the harsh marine environment. installation is quick and easy - 1" #8 screws will be provided for fastening.. This is the trailer after the addition of the bunk glides. i am very pleased with the end result. before, it was hard to launch the boat and equally hard to recover it. there was so much friction that i was afraid that i was going to pull the bow eye out of the hull. now, the boat slides easily onto the glides and i can crank the winch with one. Before i installed the surfix bunk slides launching my 18