Checkers CH4121 8 CH3 Wheel Chock Rubber, 55 in Max Compatible Wheel Dia, 10,000 lb Vehicle Wt Max, 2 Chocks, 1 PR 55KN53 Clear Phone Calls Clear Phone Calls Pressure 3000 psi Coupler Body Material Steel Sleeve Material Steel Coupler Finish Zinc Plated Series 4000 Body Material Steel Coupling Locking Type Sleeve Seal Material Nitrile Shut Off double Valve Design Ball Locking Mechanism Ball For Use With Parker 4000 Series Parker Interchange 4150 5 Pioneer Interchange 4150 5 Coupler Connection Type FNPT Operating Temp Wheel Chock Style Double with Rope or Chain Includes 3 ft Chain Material Rubber Color Black Wheel Chock Surface Tread Grooved Wheel Chock Base Tread Grooved Wheel Chock Material Rubber Max Trailers Base Tread Type Grooved Surface Tread Type Grooved Includes Sign Sign Not Included Number of Chocks 2 Includes Handle Handle Not Included Includes Chain Rope Chain Included Vehicle Weight Maximum 10