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Durable Star Knob Hand Tighten Screw Knob. Durable Design: Surface hardening treatment ensures a service life of over 100,000 cycles. Ergonomic Operation: Optimized exterior contour with anti-slip texture for comfortable handling. Customizable Features: Color, diameter, and surface treatment are fully customizable. ISO9001 Certified: Manufacturing center certified under ISO9001 and GJB9001B standards. Wide Application: Suitable for CNC panels, milling machines, automation equipment, and instruments. High-Quality Material: Constructed from durable alloy for aircraft maintenance support. Professional Manufacturer: Over 33 years of experience in R&D and production with 36 engineers.