Keep wheels stationary while loading, unloading, and servicing vehicles. Chocks for wheel diameters 30" and larger are typically used for commercial vehicles, including semi-trucks and tractors. Chocks for wheel diameters under 30" are for use on small cars, trucks, and vans.

Rubber chocks are flexible with a high-friction surface, but wear more quickly than other materials. Style 3 has multiple layers of laminated rubber to absorb shock.

Chocks with a hole, an anchor plate with hole, an eyebolt, or a chain let you connect two chocks or can be secured to prevent theft.