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 high quality 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 install it into threadhole.Specification:Material: Stainless SteelQuantity: 58pcsColor: SilverPackage Weight: Approx. 207g/7.3ozPackage list:10 x M3*0.5-M5*0.6 L610 x M4*0.7-M6.5*0.8 L810 x M5*0.8-M8*1.0 L1010 x M6*1.0-M10*1.25 L1210 x M8*1.25-M12*1.5 L144 x M10*1.5-M14*1.5 L184 x M12*1.75-M16*1.75 L221 x Storage CaseNote: Due to the differencebetween monitors and light effect, the pictures may not reflect the actual color of the item.