Miumaeov Garage Door Jackshaft Chain Hoist Chain Hoist for Roll Up Doors Garage Door Openers for Garage Door Opener Chain Hoist 331lbs

【Stable Operation】This jackshaft garage door opene features a large gear diameter (5.91 inches) and a highly efficient 3:1 transmission ratio.The 3:1 ratio and reduction drive ensures a smoother lift and requires fewer rotations to help you reach your desired lifting height. 【Strong Load Capacity】This roll up door opener is made of high quality iron and galvanized craftsmanship, the sturdy chain and construction make the garage door chain hoist has a weight capacity of up to 331 pounds, so it is especially suitable for installing next to garages, warehouses, roll up doors, etc., and it can effectively lift the garage door. 【Long Chain】The 26 ft chain provides greater flexibility in your installation and operation. Iackshaft garage door opener comes with ball bearings and lubricating oil to minimize friction. (Additional chain may be required for doors over 14 feet or vertical lift doors). 【Easy Installation And Maintenance】Straightforward design, allows you to pull up the roller shutter or garage door easily, very practical. Complete mounting accessories and smooth surface make it easy to install and clean. 【Notes】Please check the size carefully before ordering. Additional chains may be required for doors or vertical lift doors that are over 14 feet.