The Thread Repair Kit M16 x 1.5D with Replacement Inserts (5pcs) is a tool set designed to repair damaged or worn-out threads in M16 x 1.5mm threaded holes. The kit typically includes: M16 x 1.5D: This indicates the kit is designed for M16 (16mm diameter) bolts or screws with a 1.5mm thread pitch, commonly used in automotive, machinery, or industrial applications. Replacement Inserts (5 pcs): The kit includes 5 replacement inserts, which are threaded inserts that can be installed into the damaged hole to restore the threads. These inserts provide a durable, rethreaded surface that allows for the use of standard bolts or screws once the repair is complete. This kit is ideal for repairing stripped or damaged threads, ensuring that the bolt or screw can be securely fastened again. It is commonly used for restoring threads in engines, machinery, and other equipment where thread damage occurs from wear or misuse.