기능

• The unique spring mechanism absorbs the impact of steps and unevenness of the floor surface.
• Ergonomically designed with small starting resistance and rolling resistance.
• The operating part of the spring is equipped with a bushing impregnated with oil that is highly self-lubricating.
• The turning part has a shield structure that seals grease.
• large frame
• As auxiliary wheels of drive wheels
• towing vehicle