Outstanding Material Our thread lock nuts are made of high quality stainless steel and nylon, which is corrosion resistant and can prevent loosening and backing. Durable for long time use. Nylon Insert Hex nut with a thread to prevent backing, the nylon insert prevents loosening and keeps the lock during vibration. These threaded inserts are water resistant, rust resistant and sturdy. Easy to Store Individual organizer compartments are designed for easy storage. The transparent box all around makes it easy to see the wire nuts inside even when stacked. Very strong and will not open during delivery. Wide ApplicationsThe lock nuts can be used to screw bolts, as well as threaded rods and cap screws. Ideal for folding beds, cabinets, miners, motors, textile machinery, workshops, motors, etc. What You Will GetYou will get 165 pcs / 7 sizes of the most commonly used lock nuts, including 45 pcs M3 nuts, 35 pcs M4 nuts, 30 pcs M5 nuts, 25 pcs M6 nuts, 15 pcs M8 nuts, 10 pcs M10 nuts and 5 pcs M12 nuts. Note: It does not include other things, the color is based on the first picture, and the other pictures only show the effect. Due to the differences between different monitors, the picture may not reflect the actual color of the item. Due to manual measurement. Please allow the deviation. Thank you! Good quality product