The 6902 Open is a high-efficiency, single-row metric deep groove ball bearing optimized for applications requiring absolute minimal rotational resistance. Because it features an unshielded, open configuration, this model completely eliminates seal friction, allowing for exceptional high-speed performance and effortless oil or grease circulation. Featuring a standard 15 mm bore, 28 mm outer diameter, and 7 mm width, the 6902 provides an excellent, lightweight mechanical solution for precision machinery, electric motors, and high-performance bicycle components.