Replaces stripped spark plug threads on Ford V10, 4.6 and 5.4 liter engines. Works on the car without removing the engine head. This set includes a drill, tap, wedge tool, insert tool, 10 steel inserts, plus a vacuum adapter to remove shavings from the chamber. Shipping wt. 9 lb. 6 oz. This precision tool accurately replaces stripped Ford spark plug threads with new thread inserts. Works on the car without removing the engine head. This set includes a drill, tap, wedge tool, insert tool, 10 steel inserts, plus a vacuum adapter to remove shavings from the chamber. The tool set installs a new spark plug thread insert in the exact original position in approximately 20 minutes! IMPORTANT: . An inspection scope must be used to insure all shavings are removed from the combustion chamber. An inspection scope is not included.