The Starrett 173MAT, Millimeter Reading Thickness Gauge with Tapered Leave is used in automotive, aviation, diesel and farm equipment manufacture and services 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. Includes 13 leaves ranging from .03 to .50mm thickness. 13 Tapered Leaves, 12.7x77mm, mm reading, 0.03-0.50mm Range.