Circular solid bonded abrasive wheels with central through-holes, made from abrasives and binder resins. Angle grinders are a type of abrasive tool widely used due to their large consumption and versatility, rotating at high speeds to perform coarse, semi-finishing, and finishing grinding on the outer and inner circles, flats, and various profiles of metallic or non-metallic workpieces, as well as cutting and slotting operations. There are numerous types of angle grinders. They can be categorized by the abrasive material used (common abrasives like corundum and silicon carbide for wheels, and natural abrasive super-hard abrasives like diamond and cubic boron nitride for wheels); by shape (flat wheels, bevel wheels, cylindrical wheels, cup wheels, disc wheels, etc.); and by binder (ceramic wheels, resin wheels, rubber wheels, and metal wheels). The characteristic parameters of abrasive wheels include abrasive type, viscosity, hardness, binder, shape, and size. Since abrasive wheels typically operate at high speeds, they should undergo a rotation test (to ensure they won't crack at high working speeds) and a static balance test (to prevent vibration during operation) before use. After some time of operation, the wheels should be trued to restore their grinding performance and correct geometric shape.