Build your own custom scaffold tower to fit your specific needs for home repair, maintenance and building construction. The 8-Inch Heavy Duty Caster is designed for use with exterior scaffold units. Caster wheels with dual locking-Foot brakes, allow for easy movement across concrete and other smooth and solid surfaces. That"s a big help when you don"t have time to tear down and rebuild the scaffold. Meets OSHA and ANSI scaffolding regulations.