"For glow plug testing on Mercedes, BMW 2.4L, Lincoln Mark VII Continental, Puegot 2.0L and 2.3L, VW Volvo, Audi 1.5L, 1.6L, 2.0L, 2.6L, GMC truck W4, W7, W7HV, Hino, and Isuzu. (12mm x 1.25)