"Black Ice Snowmobile Ski Guides protect snowmobile carbides and trailer or truck beds from damage that can be caused when unloading and loading snowmobiles for transport. The 6-3/8"" W ski guides feature a low-profile 1/4"" thick grooved surface designed to reduce friction, allowing snowmobile carbides to easily glide along smoothly. These ski guides include recessed mounting holes to create a flush attachment to your trailer or truck bed. Manufactured from durable, long-lasting HDPE, these guides won’t crack or chip even in extremely cold temperatures."