Gravel Tuff GTF-12SCFF 12" Swivel Flat Free Caster Gravel Tuff's Swivel Caster will get your equipment where it needs to go Made of high-density polyurethane material with a sawtooth tread for a flat-free tire This caster is the ideal size with a wheel diameter of 12"; has a weight capacity of 330 pounds! The zinc-plated finish adds even more durability and long-lasting quality to this great product 1 year limited Manufacturer's warranty