10 mm split nut will work on Ford 6.9L and 7.3L diesels GM 5.7L 6.2L and 6.5L diesels and various diesels in import vechicles12 mm split nut works on various diesels in import vehicles plus many agricultural and construction diesel applicationsIncludes 10 mm and 12 mm slip nuts three spacers 3/16 1/4 and 5/16 InPlastic storage case and instruction manual includedOTC Glow Plug Remover Tool Set has a 10 mm split nut that will work on Ford 6.9L and 7.3L diesels, GM 5.7L, 6.2L and 6.5L diesels and various diesels in import vehicles. The 12 mm split nut works on various diesels in import vehicles, plus many agricultural and construction diesel applications. Set includes 10 mm and 12 mm slip nuts, three spacers 3/16 1/4 and 5/16, plastic storage case, and instruction manual.