The Steel Wheel Chock in fabricated steel has an open face radius that allows chock to be used with any size tire and includes the chain. The OSHA wheel stop is a bold yellow that is clearly visible. The dimensions of the safety fabricated steel wheel chock are 10.5" Width x 10" Height x 7.5" Depth. Steel wheel chocks comply with OSHA Standards 1910.178(K)(1) & 1910.178(K)(7) when used with stabilizing jacks (sold separately). OSHA recommends utilizing 2 wheel wedges per trailer.