The set includes 25 M8 threaded inserts, 1 T-mounting tool, 1 punch, 1 8.3mm drill bit, 1 8mm straight flute tap, 1 small hex wrench Stainless steel female thread inserts, which are resistant to impact and abrasion, can form a stronger internal thread in low-strength materials. This thread repair tool kit is used to repair damaged or worn M8 threads and is ideal for engine maintenance and other automotive applications. High-speed steel twist drill and straight groove tap, installation and punching tools with red plastic handle, strong and wear-resistant, practical and durable. Installation is simple, after drilling with the twist drill to make a hole, re-tap the thread with the tap, then screw in the threaded insert and break the crossbar of the insert.