Sidewinder, Rolling Carriage, Skateplate, Transforms Right Drive Circular Saw (Sidewinder) Into A Precision Cutting Tool, Two Durable Polyurethane Rollers With Delrin Bearings Put Saw On A Rolling Track Ensuring Minimal Friction During TheCutting Process, Making Straight & Smooth Cutting Easy, While Increasing Cut Efficiency, Highly Durable Glass Filled Nylon, Fits Wide Range Of Corded, Right Drive 7-1/4" Circular Saw Brands, Installation & Removal Of Skateplate Takes Minutes, Reduced Kickbacks, Less Strain & Fatigue, Nominal Amount Of Cut Depth Loss, Includes Skateplate & Skateguide.