"This Fairbanks Phenolic/Canvas Swivel Caster is ideal for applications where smooth, quiet and mobile operation is required. Wheel Diameter in. 4, Bearing Type Roller bearing, Wheel Width in. 1.25, Caster Type Swivel, Overall Height in. 5, Finish Type Zinc-plated, Capacity lbs. 300, Wheel Type Phenolic canvas, Post in. 1/2-13 x 1, Material Type Phenolic/canvas, Casters qty. 1. Durable construction and cold-formed Rust-resistant electro-galvanized zinc finish Phenolic/canvas wheel Stem dimensions 1/2 in. dia. x 1 in. L, 13 threads per in."