. 1. The U-nut is a fastener composed of two flaps in clip form with two external raised thread forms. 2. The design of this nut means that a double elastic force is exerted when tightened. 3. This nut can be in place manually when tightening. 4. No tools are required to mount U-nuts, and they can be assembled much more quickly and than conventional nuts. 5. The self-locking feature means that costly operations such as tapping, welding or riveting can be avoided. 6. It can also be used with fragile materials such as glass, plastic or enameled surfaces. In these cases the resilience of the nut avoids cracks or damage to the application area. 7. This nut locks with tightening torques much lower than for standard nuts due great resilience. It is normally mounted of a panel it can also be used in a rectangular mounting hole in the middle of a panel. 8. U-Nuts a strong and secure fixing for applications where two or more panels require holding together. Compatible With:fit for motor vehicles, domestic appliances, electrical equipment and machinery. Hole Diameter: . 6mm, 8mm, 10mm, 12mm size:17.8 * 10 * 2.3 cm Material:metal colour: copper Package Contents: 35 * M6 U-clips 25 * M8 U-clips 25 * M10 U-clips 25 * M12 U-clips Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.