Function: It is a new mounting and demounting tool in the shape of a duck head used for many tire changer machines. It can be used for many times with stable and high performance characteristics. Slim design With smooth surface to reduce friction, make tire changing faster and more efficient. At the same time, it prevents the wheels from getting scratched and damaging the wheels when clamping the wheels inside the clamps.Usage: The insert shape is designed according to the duck head shape and the edge of the rim, easy to use. It is durable enough to withstand the stress of larger tires and wheels. Diameter: Installation hole diameter is 30mm; Total size: 17.7 * 8.5cm / 6.9 * 3.3in.Material:This demounting head is made of high quality stainless steel material, which is high strength and durable.Product This is a demounting tool and dismantling-tires made of stainless steel 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 damaging grinding wheels when tightening wheels of inner flangesSpecifications:Condition: 100% Brand NewMaterial: Stainless SteelColor: Silver+YellowInstallation Hole Diameter: 30mm / 1.2inOverall Size: 17.7 * 8.5cm / 6.9 * 3.3inPackage Weight : 751g Package Contents: 1 * Tire Changer Mounting/Demounting Tool Notes: 1. please kindly check the dimension and pictures to make sure perfectly fit your machine.2. It is easy to install, but professional installation is always recommended.