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These are N-gauge 5.5 mm diameter (scale 2'9" diameter) 3-hole disc wheels with 14.8mm pinpoint axles. Parkside/Romford do some nice curve-spoked wheels this size for 009 narrow-gauge, but not 3-hole discs for N-gauge (yet?). There's hardly any difference from the 5 or 6.2 mm diameter 3-hole discs and they're probably quite pricey so I'm not expecting many takers, but they were no trouble to do and if you can't source commercial wheels (it happens sometimes) and you have to consider buying printed ones, you might as well at least have exactly the right size. They're meant for the 40t armour plate truck I've just done, and they're also the right size for several other low-loading bogie wagons like warwells and warflats.