1. Material Used On 40 mm X 18 Gauge CR Square Pipe Legs and 25 mm X 18 Gauge CR Round Pipe Supports, Steps, Railings. Beds Material 25 X 50X 18 Gauge CR Rectangular Pipe With 5 Nos 25mm X 18 Gauge CR Square Pipe Ply Under Supports. Tops 12 mm Thick Plywood. Finish Powder Coated. Bunker Bed Size 30 Width X 72 Length X 72 Height.