Rigid Casters and Wheels Scaffold Scaffolding Replacement Caster and Wheel Steel Here are some new Rigid Caster and Wheel sets. 6 inch solid rubber wheel on a rigid steel caster. Bolt on via two 9/16 inch bolt holes. Stem is 1-1/2 inch wide by 4 inch tall. I would say these are for scaffolding or other similar application. Wheels are 1-1/2 inch wide. Thanks for stopping. Please visit my slow growing store, read about me, my policies and view other items that may interest you. Also, check out my other casters wheels. **I always have money saving volume discounts on most items** David - thediscountretailer LLC