Deep channel design suspends carbide runners, reducing friction Reduced friction between ski and trailer makes loading & unloading quick and easy Eliminates damage to trailer decking caused by carbide wear rods Multi-Glides accommodate snowmobiles with up to 7" of ski stance variance Extension kits are available to complete 12-foot trailers, ramps, etc. 4-30" pieces per kit Guaranteed not to break, crack, chip or wear out Ideal for open place trailers and all ramps