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Specially designed for all types of mountain bike headset, model MH-P03k, to ensure perfect matching of the bearing and frame headset interface for smooth operation. The bearing dimensions are 30.15 × 41 × 6.5 mm, which is high-precision and meets common mountain bike headset standards. Made of wear-resistant steel, it has high strength, corrosion resistance and pressure resistance, and is suitable for long-term riding and high-intensity sports. Precision-machined balls and inner and outer rings ensure smooth rotation, reduce friction and improve riding efficiency and comfort. Good sealing, dust-proof and waterproof design, reducing the entry of dust and impurities, extending the service life of bearings and bowl sets.