TG923 (metric) - .04, .05, .06, .07, .08, .1, .15, .2, .3
TGB923 (inch) - .0015, .002, .003, .004, .006. .008, .010, .012, .015
Note: Feeler gauges are used in automotive work to check spaces when adjusting tappets in an engine. It checks gaps between spark plug points and the gap between distributor points. In machine workshop, feeler gauges are used for checking bearing clearances, spacing in gears and fit the gaps between the ends of turned cast iron piston rings.