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 |