Alpha Thread Repair Tang Break Tool | No.4 is used after a compatible wire thread insert has been installed to the correct depth. Place the tool against the insert tang and strike it firmly to break the tang away, completing the installation. The No.4 designation identifies this product within the Alpha thread repair system and helps match it to the required insert size. Supplied as one tang break tool, it is suitable for replacing a missing kit component or stocking an individual workshop size. Use it only with compatible wire inserts and follow the thread repair installation sequence.