The self-tapping thread insert is a kind of fastener that strengthens the thread, which can form a high-strength inner thread hole when embedded in a soft material such as plastic, copper. It can also be used to repair the damaged inner thread. Features: 1. Made of stainless steel, it is of high hardness and low abrasion. 2. Greatly improve strength and stability of screws connection. 3. With certain elasticity and even load, it is resistant to vibration to avoid loosening. 4. Long service life - it can be used repeatedly. 5. Easy and quick to install with only one assembly tool. 6. It can also repair the damaged thread by install it into thread hole. Specification: Material: Stainless Steel Quantity: 58pcs Color: Silver Package Weight: Approx. 207g/7.3oz Package list: 10 x M3*0.5-M5*0.6 L6 10 x M4*0.7-M6.5*0.8 L8 10 x M5*0.8-M8*1.0 L10 10 x M6*1.0-M10*1.25 L12 10 x M8*1.25-M12*1.5 L14 4 x M10*1.5-M14*1.5 L18 4 x M12*1.75-M16*1.75 L22 1 x Storage Case Note: Due to the difference between monitors and light effect, the pictures may not reflect the actual color of the item. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.