hospital bed caster wheels,medical caster wheels Wheel Material:PA,TPR Size:3" x 24mm ; 4" x 24mm ; 5" x 32mm Loading Capacity:45kg-120kg Bearing Type:Precision Bearing Type:Threaded Stem,Threaded Stem With Plastic Dual-Brake,Threaded Stem With Metal Dual-Brake Widely used as medical trolley caster,Hospital bed caster.Medical cart castors,Hospital Stretcher Casters. www.casterwheelsco.com