Starrett 66MA Metric Thickness Gauge 66 Thickness Gauges Tempered Steel Thickness Gauge, .05mm-1.0mm Range, 20 LeavesThe Starrett Metric Thickness Gauge is used in automotive, aviation, diesel and farm equipment manufacture and service and also in jig, fixture, gauge, and experimental work. Especially useful in adjusting tappets, spark plugs, distributor points, checking bearing clearances and gear play, fitting pistons, rings and pins, and gauging narrow slots. Made in a wide range of types and sizes, each having from 6 up to 26 leaves ranging in thickness from .