The self-tapping thread insert is a kind of fastener thatstrengthens the thread, which can form a high-strength inner thread hole when embeddedin a soft material such as plastic, copper. It can also be used to repair the damagedinner 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 vibrationto avoid loosening. 4. Long service life - it canbe used repeatedly. 5. Easy and quick to install with only one assembly tool. 6. It can also repair the damaged thread by installing into threadhole. Specification: Material: Stainless Steel Quantity: 50pcs Color: Silver Package Weight: Approx. 192g/6.8oz Package list: 10 x M3*0.5-M5*0.5 L6 10 x M4*0.7-M6.5*0.75 L8 10 x M5*0.8-M8*1.0 L10 5 x M6*1.0-M10*1.5 L14 5 x M8*1.25-M12*1.5 L15 5 x M10*1.5-M14*1.5 L18 5 x M12*1.75-M16*1.5 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. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.