Material: industrial-grade nitrile rubber (NBR) for durability and longevity. Size variety: 32 common standard sizes, 3 mm I.D. to 50 mm I.D., to cover a wide range of needs. Organized storage: heavy-duty storage box for orderly placement and easy identification of O-rings of different sizes. High performance: industrial-grade NBR with excellent oil and UV resistance; super flexible structure and ultra-thick wall design to enhance durability. Why you need this set: - A broad size range (32 sizes) fits most standard O-ring replacements, reducing search time and misfits. - The durable material and thick walls improve service life in demanding environments. How it solves common problems: - The storage box organizes O-rings for quick selection, minimizing downtime and installation errors. - Oil and UV resistance helps ensure reliable performance in oily or sun-exposed applications. What makes it stand out: - A combination of versatile size coverage, robust NBR material, and a heavy-duty storage solution, all designed for reliability and ease of use. Use scenarios: - Automotive maintenance: replacing engine or transmission seals where oil exposure is present. - Industrial equipment: seals for pumps, valves, and hydraulic systems requiring a range of standard sizes. - Outdoor equipment: lawn mowers, generators, or other gear exposed to sunlight and varying conditions.