7800 Series Extra Heavy Duty Special Purpose Ladder Type IA Extra Heavy Duty Industrial Duty Rating: 300 lbs. - Orange 3-14" fiberglass side rails, interlocked, with surface veil top layer assures a smooth trouble-free surfaces even after weathering. Heavy-gauge steel bracket engages steel pin to lock sections in stepladder position. Wall bumper protects surface at point of contact. Plate and rung assembly is riveted at 4 points to the fiberglass side rail. Traction-Tred deep serrations in rung for slip resistance. Nylon coated aluminum slide guides for ease of operation. Non-binding aluminum spreaders. Constructed with patented 3-piece Alflo rung joint, producing a tempered joint, making the ladder Twist-Proof.