Tri-Arc WLAR103165 3-Step All-Welded Aluminum Rolling Industrial & Warehouse Ladder with Handrail, Grip Strut Tread, 16-Inch Wide Steps Spring-loaded casters 350 lb. rated capacity; Ships all-welded Grip Strut tread Standard mill finish 3/4-inch schedule 40 aluminum pipe with 1-1/16-inch O.D.