Wide Applications: The duck head of the rim clamp, with a diameter of 28 mm, is used on many tire changing machines. Compare with the pictures before purchasing an item Easy to Use: The shape of the insert is designed according to the shape of the duck head and the rim edge, it is easy to use. Avoid scratches and damage to the wheels when clamping the wheels by the inner clamps Reduce Friction: The surface of the tire changer heads reduces friction, makes tire changing faster and more efficient, can help you replace and install tires quickly and easily Premium Steel Material: Our tire changer parts are made of premium steel, high strength and durability. Not easy to damage, long use time Practical tips: Check that the head bolt and the Allen screws are tight. Make sure that the tire diameter and the wheel diameter match exactly. Easy to install, but professional installation is recommended Note: The data are all measured manually, please allow 1-3cm error, due to differences in light