The Shepherd Hardware 400-Series Thermoplastic Rubber Casters are lightweight, non-marking wheels that are impervious to water and have strong chemical resistance. These casters are a long lasting, economical alternative to other industrial caster materials. The Shepherd 9735 model features an 4 inch diamteter wheel, 360-degree swivel mount, and a 250-lb load rating. Shepherd 400-Series casters are recommended for tool boxes, bakery racks, dollies, stock trucks, hotel trucks, and other institutional uses requiring excellent mobility.