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The drill bearing is special for dental dentists. The inner and outer rings of bearing are made of special alloy stainless steel; The ball is made of refined stainless steel or super hard ceramic material with good wear resistance; The cage is made of polyimide material with high strength, low wear resistance and self-lubricating property. The high-speed drill ball bearing for high-speed drill handpiece can be exchanged with the bearings of drill handpieces made in Japan, Germany and Britain. Precision grade: ABEC7 (P4); Speed: 350000-450000 rpm at 200-250kpa air pressure; Working life: more than 6 months; Performance: ultra low vibration, ultra low noise; Corrosion resistant, no rust.