"Make it easier to move your cruiser or sport bike around the garage with the Black Widow pro aluminum motorcycle dolly, exclusively from Discount Ramps. Five heavy duty 4"" casters with sealed roller bearings make moving the dolly from side to side and back and forth a breeze. Each caster has a built-in locking mechanism which makes getting your bike on the dolly easier than ever—just lock the casters and ride right on without worrying about ramps, levers, or lifting. The track's extruded surface also provides superior traction during loading and unloading."