Metric Wheel Nuts and Bolts Description

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Metric wheel/nuts and bolts are identified in the following way:

The wheel/nut has the word Metric stamped on the face.
The letter M is stamped on the end of the wheel bolt.
The thread sizes of metric wheel/nuts and the bolts are indicated by the following example: M12 x 1.5.
M = Metric
12 = Diameter in millimeters
1.5 = Millimeters gap per thread