Function: : It is a new duck head shaped mounting and dismounting tool used for many tire changer machines. It can be used for many times with stable and high performance characteristics. Fine Design: : With a smooth surface to reduce friction, make the tire change faster and more efficiently. At the same time, it prevents the wheels from being scratched and damaged when tightening the wheels inside the clamps.Usage: : The insertion form is designed according to the duck head shape and rim edge, easy to use. It is durable enough to withstand the stress of larger tires and wheels.Diameter: : Installation hole diameter is 30mmTotal size: 17.7 * 8.5cm / 6.9 * 3.3in.< /ul> Product description Description: This is a stainless steel tire mounting and demounting tool with a diameter of 30 mm . With optimal tire changing angle and smooth surface, it is a great tool to help you change tires quickly and easily. And avoid scratching the damaging grinding wheels when tightening the wheels of the inner flanges Specifications: Condition: 100% brand new Color: silver + yellow Installation Hole Diameter: 30mm / 1.2in br/> Overall Size: 17.7 * 8.5cm / 6.9 * 3.3in Package Weight: 751g Package Contents: 1 * Tire Changer Mounting/Demounting Tool /> Notes: 1. Please kindly check the dimension and pictures to ensure perfectly fit your machine. 2. It is easy to install, but an installation professional is always recommended.