Premium Material: Our assorted hex bolts are made of premium stainless steel, which has high strength and good corrosion resistance in many environments, strong and durable for long term use. Practical Design: The cap nuts are used for visual enhancement and can protect the screw end from dirt and damage. They have a metric internal thread that ends in a blind hole thread, and injuries are avoided by the open end of the screw with a union nut. Easy to store: all hex head nuts are packed in a sturdy plastic divided box, different lengths, a completely diversified assortment, organized and easy to open and find, practical and portable. Wide use: this hex cap nut is suitable for general fastening applications and professionals, amateurs, rental companies, repairers and other DIY enthusiasts. Ideal for mechanical engineering, automotive, motorcycle, wood and steel construction, furniture, etc. Package Content: You will receive 40pcs m3, 40pcs m4, 30pcs m5, 30pcs m6, 15pcs m8, 5pcs m10,