These scaffold wheels feature an 8 in. wheel diameter, with a 1-3/8 in. round stem and two locking holes at "2" and "2-1/2" to fit most standard scaffold frames and legs. The double locking mechanism combines friction and interdigitating metal locks, using red rubber components to stay securely in place once locked, and the locks are easy to set and release without bending over. Each wheel supports up to 1100 lbs. with a 4-pack total load capacity of 4400 lbs. making them durable for heavy-duty tasks like commercial construction, drywall work and painting projects. They come with two grease zerk fittings for simple maintenance, ensuring smooth rolling and longer service life. The poly wheel surfaces leave no marks on floors, protecting delicate indoor surfaces while holding up on rough concrete, and the galvanized caster bodies are suitable for outdoor use. They also include two pin holes to work with nearly all manufacturer’s scaffold legs and frames, ideal for rolling scaffold towers and related accessory setups.