These are our standard steel 3-finned skids made for our smaller 903 lateral hydraulic root cutter motors. These motors are for lines from 3? to 8? and they have a front 5/8? shaft. Skids are available in 3? size that are a pair of rings that go around the motor body to protect it while it travels down the pipe. The other skids are for 4?, 6? or 8? pipe and you can see them here. They all connect to the motor body by way of 3 separate set screws. Please see our lateral hydraulic root cutter motor complete kits where you can see these skids already included in a set. Please see S-903-1.