Description:This is a steel tire changer mount demount duck head tool. With optimal tire change angle and smooth surface, it is a great tool for help you change tires fast and esily. There are 28mm andamp 30mm for your choice, directly replacement for the old one.Features:Brand new mount demount duck head tool used for many tire changer machines. The insert shape is designed according to the shape of the duck head and the edge of rim, easy to use. With smooth surface to reduces friction, make the tire change more faster and efficient. It prevents wheels from scratching and damaging when clamping wheels from inside clamps. Made of high quality steel material, high strength and durable. Specifications:Material: Steel and Electroplating(surface)Color: SilverInstalling Hole Diameter: 28mm or 1.1", 30mm or 1.2" (optional)Overall Size: 190 x 100mm or 7.5" x 4"Package Weight: 732-758gPackage Included:1 x Tire Changer Mount or Demount HeadNotes:1. Please check our photos with measurements to make sure it fits your machines.2. It is easy to install, but professional installation is highly recommended..