Replaces stripped spark plug threads on aluminum heads with 14 millimeter spark plugs Installs a new spark plug thread insert in original thread location Kit comes in blow-molded case for storage The repair can be completed very quickly and easily Inserts are 18mm The set includes one-piece drill tap, long tap holder, short tap holder, insert installer, wedger and handle. It also includes three insert sizes 5/16 inches, 7/16 inches and 11/16 inches.
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