Easily attaches to 2X4 or 4X4 lumber as an alternative to metal or wooden rungs, cargo nets, rope ladders, or firefighter poles. Fits 21-1/2 in W openings; designed for all PlayStar play stations. 30-minute installation time. Double-wall molded high-densitypolyethylene construction. 250-pound weight rating. Includes 1 Play Action 1-1/2 in thick vertical climber, all mounting hardware, and easy-to-follow instructions. Lumber sold separately.