M14x1.25 spark plug repair tooling Extended: For applications that require deeper reach into the head. The 4412E tooling works very well in holes 6" deep or more. The installation is exactly the same for taper seat or washer seat you only need the appropriate length/style of insert. Kit does not include taper inserts please order separately. Inserts Included 5 inserts with 16.8mm metric length - Part # 44111