Features: Make of stainless steel , high strength and good corrosion resistance. Nylon insert lock nut work by pressing a nylon link against the bolt thread and trapping it in place. Assembly torques is more stable, antiloosening is very reliable, can be used in shock vibration occasions. Suitable for use or maintenance in a wide ranges of applications such as furniture decoration, automotive repair, machinery industry, door handles, the mechanical industry and small repairsaround shops, construction. 250pcs locknut of different size are put in the organizers by category, easy to store and use. And it is easy to categorize. Specifications: Materials: Stainless Steel Size: As Shown in the Picture Package Includes: 65Pcs 3mm 55Pcs 4mm 45Pcs 5mm 35Pcs 6mm 25Pcs 8mm 15Pcs 10mm 10Pcs 12mm note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to difference between different monitors, the picture may not reflect the actual color.