High-quality material: Self-locking nuts made of durable A2 201 stainless steel with nylon insert. The hexagonal nut has a smooth surface with a metallic shine and offers good corrosion, rust, and oxidation resistance. Suitable for indoor, outdoor, and damp environments. Specification size: Includes 50 pieces of M6 stainless steel locking nuts. Choose the hex nut based on screw or bolt size. Multiple sizes available to meet various fastening needs. Easy to use: Stainless steel locking nuts are easy to install, even in tight spaces. A torque wrench or screwdriver is sufficient to tighten the nut. Can be removed and reused as needed. Practical function: Self-locking stainless steel nut. When tightened with a threaded bolt or screw, the nylon insert deforms to fill the gap and prevent loosening, providing reliable locking performance. Wide application: Hex locking nuts offer excellent vibration and anti-loosening performance. Ideal for use in construction, metal and wood structures, automotive, transportation equipment, electrical devices, machinery, and general industrial applications.