Usage Tips:Function: It is a 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. Fine Design: With a smooth surface to reduce friction, make tire changing faster and more efficient. At the same time, it prevents the wheels from scratching and damaging the wheels when clamping the wheels inside the clamps. Usage: Insert shape is designed according to 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 30mm; Total size: 17.7 * 8.5cm / 6.9 * 3.3in. Material: This demount head is made of high quality stainless steel material, high strength and durable. Product 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 damaging grinding wheels when tightening inner flange wheels Specifications: Condition: Brand Material: Stainless Steel Color: silver+yellow Installation Hole Diameter: 30mm / 1.2in 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 make sure perfectly fit your machine. 2. It is easy to install, but professional installation is always recommended.