Garage Door Chain Hoist - 3:1 Reduced Drive Jackshaft Garage Door Opener, Hand-Pulled Heavy Duty Chain Hoist for Roll Up Doors, Load up to 330LBS

Stable Operation: The large diameter of the gears (5.91 in) , ball bearings and lubricating oil reduce friction during rotation, and the 3:1 transmission ratio and reduction drive ensure smoother lifting and lowering Strong Load Capacity: Sturdy chains and construction give the garage door chain hoist a weight capacity of up to 331 lbs, so you can lift your garage door with confidence Strong and Durable: The roll up door opener is made of quality iron with galvanizing process, which is not easy to rust, wear and deform Long Chain: The 26 ft chain provides greater flexibility in your installation and operation. But additional chains may be required for doors or vertical lift doors that are over 14 feet Application: The jackshaft garage door opener is mainly installed next to garages, warehouses, shutters, etc. The hand-pulled chain lifts the door