Our 8-inch Heavy Duty Caster Wheel with Double-Lock Pins is a sturdy, safe, and reliable scaffolding wheel designed to be used with outriggers on Metaltech scaffolding frames. These heavy-duty wheels are also usable on most other standard scaffolding frames. They're built from industrial-strength polyurethane and mounted on cast-iron hubs with grease-fitting adapters for easy maintenance. Each wheel can support a total weight of 750 pounds and is built primarily for use on concrete floors. Each attachable wheel can be affixed to exterior standard scaffolds or arch frames. These 8-inch Polyurethane caster wheels can help significantly reduce job task completion hours thanks to their stability and smooth mobility, letting you move your standard scaffolding to new locations to continue the work. The 8-inch caster can be especially helpful on larger scaffolds where they need to bear the weight of two or three levels' worth of scaffolding equipment, tools, and materials. The double-lock mechanism on the wheel helps increase the stability of the scaffolding and adds a layer of safety to the work. All Metaltech scaffolding wheels meet OSHA standards of safety. Metaltech builds and designs practical, effective, efficient, and safe work equipment for office and home use. We strive to incorporate new technology and innovation into equipment and accessories that make sense, so you can get jobs done easily, safely, and on time. Material: Steel.