*Excellent material: the hex cap nuts are made of high quality nylon material, which has high strength and good resistance in many environments, solid and for long-term use.Practical design: the cap nuts are for visual enhancement and can protect the screw end from dirt and damage. They have a metric female thread that ends as a blind hole thread, and the injuries are avoided by the open screw end by means of a union nut.Easy to store: all hex nuts threaded rod hat nuts are packed in a sturdy divided plastic box, different lengths, a completely diverse assortment, organized and easy to open and search, convenient and portable.Widely Used: the hex cap nut is suitable for general fixing applications and for professionals, amateurs, landlords, repairers and other DIY enthusiasts. good for mechanical engineering, automotive, motorcycle, timber and steel construction, furniture etc.Package includes: you will receive 40 pieces 3mm, 40 pieces 4mm, 25 pieces 5mm, 25 pieces 6mm, 10 pieces 8mm, 8 pieces 10mm, 8 pieces 12mm, total 156 pieces hex nuts, which is enough for your daily use.