250Pcs 304 Stainless Steel Metric Lock Nut Assortment Kit - M3 to M12 Features: Nylon Collar Locking: Designed with industrial-strength nylon collars, these lock nuts offer superior holding power, effectively replacing traditional lock washers. Their anti-corrosive construction provides long-lasting performance and prevents bolt exposure, enhancing safety and stability. High-Quality Construction: Made with durable 304 stainless steel, these lock nuts boast strong anti-rotation ability, ensuring they remain securely in place even under vibration and torque. They resist loosening and maintain clamping strength, offering reliability for both professional and DIY projects. Versatile Assortment: This kit includes seven commonly used sizes (M3, M4, M5, M6, M8, M10, M12), covering a wide range of applications. Ideal for various projects, it's a cost-effective choice for users who prioritize quality and quantity. Convenient Storage Box: The sturdy plastic box organizes and secures the lock nuts by size, making them easy to store on a workbench or garage. Its transparent lid allows for quick inventory checks without opening. Complete Kit Contents: Totaling 250 pieces: M3 - 65 pieces M4 - 55 pieces M5 - 45 pieces M6 - 35 pieces M8 - 25 pieces M10 - 15 pieces M12 - 10 pieces Perfect for any professional or DIY enthusiast, this kit provides a robust and versatile solution for all your fastening needs.