681-55974 Features: -English and metric thickness gage. -Material: Tempered Steel. -Locking device on most gages? permits securely locking one or more leaves in position. -For adjusting tappets, spark plugs, distributor points, checking bearing clearances and gear play, fitting pistons, rings and pins, and gagging narrow slots. Product Type: -Gauges. Generic Dimensions: -Thickness: .05 - 1.0mm. Dimensions: Overall Product Weight: -0.24 Pounds.