Definitely imperial gauges - thousandths of an inch. 25 thou (= 0.025, your biggest gauge) = 1mm (ish).

You could convert. Personally I'd go and get a set of metric gauges

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I spent a lot of money on travel and racing motorcycles - the rest I just squandered.

XT660Z - Commuter, Adventurer...Racer?

www.dashmoto.net

Other bikes >> MT-03 / CG125BR-J / ER-6F
Departed >> ZXR400L3 / EC300 / DR-Z400E / DR800S / GPZ500S / GS400