For use in repairing 1996-2003 two-valve Ford Triton V8 and V10 engines Repair damaged heads from blown spark plugs with an alloy steel insert Cuts repair time from about 10 hours to 45 minutes Kit includes (6) alloy steel inserts Insert dimensions: M14x1.25 I.D. x 3/4"x16 O.D. Molded storage case included Shipping Weight: 2.1 lbs.