They are tapered gauges for measuring hole diameter. I have never seen that style. I have a set having the came function. It consists of 4 or 5 leaves, about 5" long and held together with a screw like a set of thickness gauges.
Yes for holes alright. Taper across their width, not their thickness. Pic 3 25mm+, pretty big gap for gauges that all appear to be less than 2mm thick, or is pic 3 a wedge !!
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