This is a valve stem height measurement tool for all SOHC Fiat engines, 1.1, 1.3 and 1.5.
Place this unit over an assembled valve / spring combination and acccurately measure the amount above or below stock specs, and shim the spring accordingly.
Very helpful to determine corrected valve stem height after facing valves or cutting / dressing valve seats, or milling of the cam box mating surfaces.