Global Industrial Aluminum Wheel Chock with Safety Sign & Handle An OSHA-compliant safety device that prevents accidental movement of trucks, trailers, and other vehicles! Wheel chocks prevent vehicles, trailers and other equipment from rolling inadvertently at loading docks. Built-in traction grippers create maximum friction between tires and surfaces to ensure safety of employees and personnel in loading docks at factories, commercial, manufacturing, and retail spaces. 36"H OSHA-compliant yellow handle with integrated sign An integrated high-visibility yellow handle allows the chock to be installed & removed without bending over and it has an attached two-sided 11-3/4" x 9-3/4" diver safety sign as an enhanced safety measure. Underside spurs & non-slip wheel surface for safety The chock is made of aluminum with spurs on the bottom that prevent the chock from slipping on road surfaces and a textured top surface that provides traction for wheels, ensuring maximum safety.