Feature: 1. Made of premium material, these lock nuts are sturdy and durable. 2. They can prevent vibration from loosening a bolted joint, resist loosening under vibrations to provide a locking action. 3. These lock nuts are amazing replacement for normal nuts of hardware, vehicles, home or outside applications. 4. Simple and fast to use, convenient to tighten or loosen. 5. The size of the lock nut is M4, comes with 10pcs in total. Specification: Features: 1. Made of premium material, these lock nuts are sturdy and durable. 2. They can prevent vibration from loosening a bolted joint, resist loosening under vibrations to provide a locking action. 3. These lock nuts are amazing replacement for normal nuts of hardware, vehicles, home or outside applications. 4. Simple and fast to use, convenient to tighten or loosen. 5. The size of the lock nut is M4, comes with 10pcs in total. Description: Material: Aluminum/Nylon Type: Aluminum Alloy Hex Nuts Surface Treatment: Anodize Size: M4 Color: Dark Red Quantity: 10pcs/Bag Note: Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Includes: 1 x 10pcs Nylon Insert Self-Lock Nuts