Construction Well spaced twin 1 7/8" wheels for exceptionally smooth running action. The wheels feature a hard, abrasion proof nylon surface which is particularly suitable for soft floor coverings such as carpets. Each caster is rated for 88 lbs (40 kg) load carrying capacity. The caster swivels freely 360 degrees for easy mobility. Installation Each caster is securely attached with an included plastic socket fitted over the steel caster stem for press fitting into a 10 mm hole in the target furniture item.