Product Features 1.New design automatic working head instead of crowbar and equipped with plastic protective pad to double protect the rim from damage ; 2.Adopt pneumatic locking device, operation easily and conveniently. 3.Wheel seat equip with nylon plate,can not damage the rim, suitable for many kinds of tire. 4.The hexangular shaft is made of S41mm steel material, not easy to distort, ensure the operation of low-profile and stiff tyre more safety; 5.Base of mechanical arm is a complete one set, inside with wear –resistant macromolecule nylon slide block ,to achieve smooth operation; 6.The three working pressure points to make mounting and demounting tires are save time and labor,increase efficiency at the same time; 7.The structure design is novel,the layout is reasonable,in order to use more flexible and convenient.