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Hex Anti-Theft Lock Nut for Transmission Tower. Anti-Theft Security: Prevents bolt loosening and sabotage for transmission towers and outdoor facilities. Durable Material: Made of carbon steel with hot dipping surface treatment for anti-corrosion and long life. Wide Size Range: Available in sizes M10 to M24 to fit various industrial construction needs. Multi-Industry Use: Suitable for power transmission, railway, machinery, and chemical industries. Cost-Effective: Offers low cost and best price with perfect security performance. Standard Compliance: Meets GB, DIN, ANSI, JIS, and other international standards.