Features Greatly improves the strength and stability of the screw connection. Made of high quality stainless steel, it is of high hardness and low abrasion. Easy and quick to install with just one mounting tool. It can also repair the damaged thread by installing it in the thread hole. Long service life - it can be used repeatedly. With a certain elasticity and uniform load, it resists vibration to prevent loosening. Self-tapping threaded insert is a kind of fastener that strengthens the thread, which can form a high-strength internal thread hole when integrated into soft material such as plastic, copper. It can also be used to repair damage internal thread. Specification: Material: Stainless Steel Quantity: 50 pieces Colour: silver. Package weight: approx. 192 g/6.8 oz. Package list: 10 x M3*0.5-M5*0.5 L6 10 x M 4*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-M 14*1.5 L18 5 x M12*1.75-M 16*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 do not mind before ordering. Package List