Garage Door Chain Hoist 3:1 Jackshaft Opener - 330LBS Capacity, Hand-Pulled Roll Up Door Lift, Heavy Duty Galvanized Steel Chain, 26ft Chain, for Garages & Warehouses Silver

【3:1 Reduction Drive】: Features a 3:1 gear reduction ratio and a large 5.91-inch diameter gear for smoother lifting and lowering; minimizes friction with integrated bearings and lubricating oil ensuring efficient operation and reduced effort during use. 【Heavy-Duty Capacity】: Constructed with sturdy chains and a robust build, this garage door chain hoist supports a weight capacity of up to 330 lbs; providing reliable and secure lifting for various roll-up door applications in garages, warehouses, and more. 【Durable & Rust-Resistant】: Crafted from quality iron with a galvanizing process; this roll-up door opener is designed to resist rust, wear, and deformation; ensuring long-lasting performance and reliability in diverse environments. 【Long Chain & Flexible Installation】: Includes a 26-foot long chain for increased flexibility in installation and operation; however, additional chains may be needed for doors or vertical lift applications exceeding 14 feet in height to ensure proper functionality. 【Wide Application】: Ideal for use in garages, warehouses, shutters, and other locations requiring a manual lift system; this jackshaft chain hoist offers a practical and dependable solution for controlling door movement and enhancing operational efficiency.