The HUDY Engine Break-In Bench is the ultimate tool for easy, safe, and professional break-in of your .12/.15/.21 engine. Allows for a controlled break-in process that reduces wear & tear on engine components and increases performance, reliability, and longevity. Constructed of top-quality components of tough aluminium and spring steel, the Break-In Bench comes partially assembled from the factory to get you running sooner.Thick alu. base plate with integrated clamps allows quick, solid mounting on any workbench. Large protective propeller shroud safely covers the included prop. Includes pre assembled throttle linkage, universal engine mounts, large-capacity 125cc fuel tank, prop spinner, and all necessary hardware. Requires use of an electric drill (not included) to spin the prop. Break in your engine like the pros!