"Cotterman 5-step rolling ladder with two 10in. semi-pneumatic rear wheels provides easy entry to tractor trailers in places where loading docks and bays are not available. U.S.A. Item is on backorder until early May. Steps qty. 5, Finish Type Gray powder coat, Base Size W x D in. 32 x 60, Caster Size in. 10, Step Type Grip strut, Step Width in. 24, Caster Type Semipneumatic rear wheels, OSHA Approved Yes. Slip resistant heavy-duty grip strut treads Gray powder coat finish resists corrosion California residents need to order item # 1439931"