Features: 1Heavy Duty Build: This product is made of strong iron which is sturdy and durable; It also has the function of preventing rust and corrosion and can be used for a long time. 2Different Positions: It can be used in conjunction with the support channel and the movement direction can be set to make the elevator work in different positions. 3Product Performance: The wheel has no noise and stable operation during use; It ensures safe operation reduces resistance and has a higher load bearing capacity. 4Applicable to: The wheel trolley assembly is suitable for various usage scenario such as to install on ceiling cart systems or electric lifts using it in your DIY project and using them upside down according to actual needs. 5Product Installation: The distance between the bottom hole centers of the pillar passage trolley can meet the location requirements for different types of electric hoist installation holes. If fixing screws are installed inside the support channel the tram will not be able to pass through the track so it is necessary to install screw to fix the support channel outside the track. Specification: Item Type: Wheel trolleyWeight: 1586.00g/55.94ozMaterial: Iron Package List: 2 x Wheel Trolley Note: If fixing screws are installed inside the support channel the tram will not be able to pass through the track so it is necessary to install screw to fix the support channel outside the track.