Function: This is a new duck head shaped mounting and demounting tool used for many tire changer machines. It can be used for many times with stable and high performance characteristics. Thin 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 getting scratched and damaging the wheels when clamping the wheels inside the clamps. Usage: The insert shape is designed according to the shape of the duck head and the rim edge, easy to use. Its durable enough to withstand the stress of bigger tires and wheels. Diameter: Installation hole diameter is 30mm; Total size: 17.7 * 8.5cm / 6.9 * 3.3in. Material: This disassembly head is made of high quality stainless steel material, high strength and durable. Product This is a stainless steel tire assembly and disassembly tool with a diameter of 30mm. With optimum tire change angle and a smooth surface, this is a great tool to help you change tires quickly and easily. And avoid scratching damaging grinding wheels when tightening the inner flange wheels Specifications: Condition: 100% brand new 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 assembly / disassembly tool Notes: 1. Please kindly check the dimension and pictures to make sure fit your machine perfectly. 2. It is easy to install, but professional installation is always recommended.