Aluminum Plywood Ladder Hatch Deck is made by 6061-T6 or 6082-T6 aluminum extrusion and fire-proof plywood panel, plank width 24" or 28", plank length from 7' to 10'. Hatch Ladder: Aluminum 6061-T6, 7-step ladder The plank complies with OHSA & ANSI A10.8 requirements. Safety load is 75lb/ft2.