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This model is unsealed. It has an Inner diameter of 4.000", an outside diameter of 4.750", and a width of 0.375". Thin Section Four-Point Contact Ball Bearings (also known as X-type bearings) are unique because of their extremely thin cross section, which achieves weight reduction for light-and-medium-duty applications with slow or intermittent rotation. This kind of bearings are designed to save space, lower overall weight, dramatically reduce friction, and provide excellent running accuracy. With Thin Section bearings, you can optimize your design and save cost without sacrificing bearing performance or service life. There are two centers of raceway radius on each side of the raceway, both of which are deviated from the centerline of the steel balls. This structure forms a four-point contact between balls and raceway. This kind of bearings can carry radial loads and axial loads in double directions; therefore, one Four-Point Bearing can replace two Angular Contact Ball Bearings that can carry radial load and single-direction axial load. Note: X-type bearings are typically used singly. On the other hand, the use of two X-type bearings on one shaft may produce an additional friction torque. Quality assurance is our promise. Company owns processing facilities with the international certifications; we regularly test our bearings for conformity and quality on all critical factors. We accept the globally accepted third parties such as SGS, ASIA, and etc. in order to insure our bearing qualities based on customer requirements. Additionally, our manufacturer is ISO 9001:2008 certified.