MaterialTorsion Spring Winding Bars are made of steel, equipped with anti slip rubber handle for secure grip Size InformationTorsion Spring Winding Rod (length) measures approx 44cm/17.32inch, diameter approx 1.2cm/0.5inch Professional ToolWinding cones should be wound and unwound 1/4 turn at a time. Torsion spring rods are not for use on winding cones larger than 33/64" in diameter ApplicationSolid Steel Metal Winding Bar Hardware can be used for unwinding and winding torsion springs, great for adjusting the torsion spring to keep balance the weight of a garage door Essential ToolSteel torsion rod allow you to safely perform torsion spring replacements and adjustments without worrying about keeping the spring tension under control Package Includes: 2 Winding Rods Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.