These ladders are available in either straddle or non-straddle design. Choose the straddle base for areas with permanent obstructions or non-straddle base for standard applications. When tilted, ladder rolls smoothly on 4" wheels. Straddle base ladders include a removable tool tray that measures 24" x 10". Uniform capacity is 350 lb Available with perforated steps or grip strut steps. Blue baked-in powder-coated for added toughness. Units are shipped knockdown some assembly required.