Retractable 4th Wheel Attachment

XSTO retractable 4th wheel attachment is a kind of auxiliary equipment which can be assembled into XSTO stair climber products. When people take stair climber to carry heavy goods on the ground, XSTO retractable 4th wheel attachment can help stair climber become a four-wheeled vehicle, so heavy goods become easy to move. If people want to go upstairs and downstairs, it can be folded (Foldable design), make sure go upstairs and downstairs smoothly.
The material of XSTO retractable 4th wheel attachment is aluminium alloy, so it have the advantage of lightweight, novel and beautiful, convenient, high strength, fold-able, easy to operation, and so on. It can be used for various scenarios of heavy handling.