Features:These self tapping thread inserts can be installed directly and do not need you to tap a thread first.They are used in low strength materials such as aluminum, magnesium, can avoid thread damage and get a good connection performance, to enhance connection strength and improve connection condition.Used for parts that requires frequent removing, it can greatly improve service life and wear-resistance of screw thread.It can prevent screw from getting loose, especially used for products requiring high coefficient of insurance.Easy to maintenance, install a thread insert into a damage screw hole, then the screw hole can be used as normal, in order to avoid workpiece loss.Specifications:Material: MetalInner Thread Size: M4(diameter) x 0.7(pitch) x 8mm(length)Outer Thread Size: M6.5(diameter) x 0.75(pitch)Drilling Diameter: 5.8~5.9mm(plastic); 6.0~6.1mm(aluminum alloy); 6.1~6.2mm(cast iron)Min. Drilling Depth: 10mmQuantity: 20pcsWeight: 20g(approx.)Package Includes:20 x Threaded Inserts