Primacy Single Wheel casters are designed for hospital beds and other central locking applications. The Durable, non-marking wheel provide improved turning capabilities. A high-quality synthetic cover is placed over die cast aluminum frame to increase chemical and water resistance as well as appearance. Precision bearings in swivel section and wheels provide greater swivel and rolling motion. Caster stems meet industry standards to integrate with existing central locking brake systems. Primacy Twin Wheel casters meet ISO Standard 22882: 2004 Casters & Wheels – Requirements for Casters for Hospital Beds.