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Nine-Size Wheel Hub Bore Step Gauge
This is a hollow stepped cone for checking a wheel's centre bore. It has nine 4 mm lands for the common hub sizes: 72.6, 67.1, 66.1, 64.1, 63.4, 60.1, 57.1, 56.1 and 54.1 mm. Each land is 0.1 mm under nominal, so the largest step that slips into the bore gives its size, which tells you which hubcentric ring to buy (73 mm across, 36 mm tall).
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