The Raider SP-320 5/8" Tie Down Kit keeps your snowmobile in one place on the trailer. The tie down bar, bolt, and crank plate are constructed of heavy duty steel for lasting durability. The included ski protectors are made of soft vinyl and fit on the trailer tie down bar to protect your snowmobile skis from slipping, paint chipping, and rusting. This kit includes everything you need to keep your snowmobile in place while traveling.