The 230 Economy Straight Leaf Feeler Gauge is ideal for adjusting and gauging spark plugs, distributor points and valve clearances, as well as measuring spaces between parts.
Each leaf is etched with a size number (its thickness) measured in thousandths of an inch, as well as its millimeter equivalent
Knurled lock nut holds leaves in desired position
Leaf thickness 0.0015 to 0.025 in. (0.038 to 0.635mm)