Features These self tapping thread inserts can be installed directly and you don't need to tap a thread first. Used for parts requiring frequent removal, it can greatly improve the service life and wear resistance of the thread. They are used in low-strength materials such as aluminum, magnesium, can avoid damage to the thread and achieve good connection performance, to improve the strength of the connection and improve the connection status. Easy to maintain, install a threaded insert into a damaged screw hole, then the screw hole can be used normally, in order to avoid the loss of part. It can prevent the screw from loosening, especially used for products requiring a high insurance coefficient. Specification: Material: Metal Inner 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: 10 mm Quantity: 20pcs Weight: 20g (approx.) Features: They are used in low-strength materials such as aluminum, magnesium, can avoid damage to the thread and achieve good connection performance, to improve the connection strength and improve the connection status.Used for parts requiring frequent removal, it can greatly improve the service life and wear resistance of the thread.It can prevent the screw from loosening, especially for products requiring high insurance coefficient. .These threaded inserts Self-tapping machines can be installed directly and you do not need to tap on a thread first.Easy to maintain, install a threaded insert into a damaged screw hole, then the screw hole can be used normally, in order to avoid loss of part. The package includes: 20 x threaded inserts Package List