01、Supports Can be installed under the trolley to lift it off floor to realize 360°rotation, suitable for small equipment or nursing cart. 02、Foot pedal for central locking caster. 3&4&5 Walking-frame & caster. Extension swivel front wheels and Walking-Aid Caster Top Fitting： Directly Into extension directional rear wheels performs perfect moving. 6&7 Long and short connecting rod as spare parts Housing Material：Nylon can be used in hospital bed, Zinc alloy material, firm and reliable. Tread Material：PU Fitting Stem Diam： 05、Walking frame caster Total free or directional is available, can be installed easily by grip stem.