HeliCoil 5546-12 M12x1.75 Metric Coarse Thread Repair Kit HeliCoil??ç?í 5546-12 M12x1.75 Metric Coarse Thread Repair Kit HeliCoil Inserts Heli-Coil has the most effective and universally accepted method of thread repair. Heli-Coil inserts quickly and permanently restores stripped, worn or damaged threads to their original size and condition. Inserts work in any part of material; aluminum, magnesium, cast iron, bronze, etc. The use of light weight materials in fuel efficient cars means more thread damage..there is a Heli-Coil insert to repair virtually every application. Restore parts that otherwise would have to be scrapped. Thread Size M12x1.75 x 18.0mm Length Tap Part No. - 2087-12 Installation Tool Part No. - 3747-12 Tool Type - 2 Insert Package Part No. - R1084-12 Drill Size - 31/64" (Drill bit not included.) 6 Inserts Per Kit FREE SHIPPING in the USA!