"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, Wheel Type Phenolic canvas, Material Type Phenolic/canvas, Post in. 1/2-13 x 1, Casters qty. 1, Capacity lbs. 300, Caster Type Swivel, Overall Height in. 5, Finish Type Zinc-plated. 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."