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Model 6903-2RS - Inner diameter 17 mm, outer diameter 30 mm, width 7 mm Manufactured from high-quality, wear-resistant 100Cr6 bearing steel Protected by (2RS) double rubber seals for extended service life Pre-lubricated with grease, ready to use out of the box, and maintenance-free under normal conditions Commonly used in electric scooter hubs, self-balancing scooters, small water pumps, power tools, home appliances, gearmotors, etc.