The ADVENTURE PLAYGROUND SERIES (APS) systems are our flagship designs offering high quality, heavy use components. APS systems use 5 inch. OD. galvanized upright posts, and our 4 ft. x 4 ft. vinyl coated perforated steel decking. We offer an infinite number of modular design possibilities to meet your organizations application. Utilizing our Collar Lock© Anti-Slip Hidden-bolt through tab connection system will incorporate a safe seamless design!