Description Time-Sert 4212 M12 x 1.25mm Metric Spark Plug Thread Repair Kit. Time Sert Thread Repair Kits Made in USA. Time Sert 4212 Thread Repair Kit M12 x 1.25mm spark plug repair kit p/n 4212 tooling THIS KIT DOES NOT CONTAIN INSERTS. PLEASE ORDER YOUR INSERTS FROM THE LINKS BELOW. Click here: for video instructions  Order Washer Seat Inserts Click Here Get Useful Tools, Tap Guides, and More Click Here  Click Here For Instructions