Smooth curb transition, can be used in multiples for increased curb access (i.e., custom lengths) * Works great in all weather conditions, extra traction with a grooved surface * (2) Pre-drilled 1/2"D holes with a 1" recess for permanent mounting application * Portable and adjustable, great for vehicle, dolly, and other equipment weighing up to 20 tons * Strong, high density black rubber