1. Product Overview B28-30 non-standard single-row open deep groove ball bearing, overall dimension 28mm inner bore × 59mm outer diameter × 30mm ultra-wide width, small inner hole plus wide thick-wall heavy-duty design, fully interchangeable with original NSK B28-30, matched for various passenger car CVT driven pulley medium-heavy torque transmission system. Open design without rubber sealing rings, equipped with stamped low-carbon steel cage and factory standard C0 internal