Features: _x000D_ The ceramic rolling bearing is suitable to work in harsh condition of corrosive fluids, because ceramic is almost not afraid of corrosion._x000D_ _x000D_ Due to the lower density of ceramic rolling balls and much lighter weight than steel, the centrifugal effect to external race can be reduced by 40% when rotating, thus greatly extend the service life._x000D_ _x000D_ The ceramic is less affected by thermal expansion than steel, therefore, when bearing clearance is certain, it can work in a environment where temperature changes more severely._x000D_ _x000D_ The elastic modulus of ceramic is higher than steel, so ceramic is not easy to deform under stress, which can improve work speed, and achieve a higher precision._x000D_ _x000D_ Widely used for medical apparatus and instruments, cryogenic engineering, optical instrument, high-speed machines, high-speed electric machinery, printing machinery, food processing machinery, aviation, spaceflight, navigation, petroleum, chemical industry, automobile, electronics, metallurgy, electric power, textile, pumps. _x000D_ _x000D_ _x000D_ Specification: _x000D_ Model: 6804 _x000D_ Inside Diameter: 20mm / 0.8in_x000D_ Outer Diameter: 32mm / 1.3in_x000D_ Thickness: 7mm / 0.3in_x000D_ Color: White_x000D_ Type: 6804 full ceramic bearing_x000D_ Material: Zirconia ceramics_x000D_ Rolling Element Row: Single row_x000D_ Race Type: Deep groove race _x000D_ Weight: 17g / 0.6oz (approx.) _x000D_ _x000D_ _x000D_ Package list:_x000D_ 1 * Bearing