12mm Jam Nut Valve Adjustment Tool
Designed for a wide variety of cars with 12mm jam nut valve adjustment screws.
This two in one tool has a window in its socket so the technician can see the position of the screwdriver blade holding the
adjustment screw as the jam nut is tightened.
This visual contact in addition to the feel of holding the screwdriver The unique handle pivots from one side to the other, so the window is always visible.