This gage incorporates four adjustments to cover the various length studs in service. A knurled nut is loosened and a slider mechanism is used to line up set marks for the individual stud being measured. The nut should then be tightened. The indicator gage reads upright via the rocker mechanism. The indicator gage can be rotated 360 degrees and clamped at any position to accommodate the various stud locations on the engine. This unit comes complete with a storage box to ensure safe storage.