vehicle spark plugs that use 3/4 reach washer seat spark plugs. M14x1.25 spark plug repair kit (Kit does not include inserts order separately.) Search this insert item B00I9D3T8U for 3/4 reach washer seat. 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.