Description Especially on irregular surfaces such as carpeted or tiled floors, twin-wheel casters distribute the load more evenly than single-wheel casters, ensuring smoother travel. These swivelling casters have a simple, modern design that complements various furniture styles. Each has a zinc-alloy central support, a steel axle and paired nylon wheels with polyurethane treads that won't mark finished floors. A roller bearing permits smooth operation, and a foot-operated brake mechanism locks the wheel. The smallest caster supports 77 lb (35kg) and has a 1 7/8" square mounting plate; larger sizes support 176 lb (80kg) each and have 2 3/8" mounting plates. Fasteners not included. Sizes given are wheel diameter by overall height. Made in Italy.