Specification: Material: high-carbon steel, aluminium With 2 non-slip winding bars Minimum 16000 cycles Electrophoretic Coated Important note: For safety reasons, please do not choose smaller springs Performance: The garage door torsion spring has a very high load-bearing capacity, which can withstand at least 16000 cycles and is not easily lost in elasticity during use Professional installation: Installing garage door torsion springs requires experience and skills, and it is strongly recommended to install them professionally Installation steps: 1.Remove the old spring, remove the spring, bearings, drum, and wire rope, and check other components for wear. 2. Install the new spring, fix the center bearing and end plate bolts to ensure that the components are firmly installed. 3. Winding the spring, using the spring adjustment lever to gradually wind the spring. 4. Test the garage door, manually test by the user, slowly pull the release rope, check whether the garage door lifts smoothly and can be parked in the half-open position. 82B is suitable for high-load and high-fatigue springs, such as heavy-duty vehicle suspension springs, railway springs, high-end garage door springs, and mechanical impact springs.