These gages are used in automotive, aviation, diesel, food and agricultural industries. They're also used in jig, fixture, gage and experimental work. In automotive, they are especially useful when adjusting tappets, spark plugs, distributor points, checking bearing clearances and gear play, fitting pistons, rings and pins and gaging narrow slots. Made in a wide range of types and sizes, each having from 6 up to 26 leaves ranging in thickness from . 0015-. 200" and 0. 03-5mm thick, straight or tapered.