Buffalo Tools GSC8 8-Inch Caster with Foot Brake for GSF55 Scaffold Frame For use with exterior scaffold frames, Dual locking with foot brake 800 lb. load capacity, Meets OSHA and ANSI scaffolding regulations 8 x 2-Inch non-marking wheel, 1-3/8-Inch stem, 1/2-Inch hole Each caster weighs 12.5-Pound Sold individually