ball bearing dual wheels caster,Twin wheels hospital bed casters with brake,Twin wheels medical caster with brake Wheel ... x 56mm ; 5\" x 80mm Loading Capacity:60kg-120kg Solid stem size: 28mm D x 40mm L Bearing Type:Delrin Bearing ... Thread Swivel,Stem Swivel Widely used as hospital bed caster,Medical trolley caster, stretcher caster,Laboratory Casters,healthcare bed casters,medical devices casters www ...