RT312M CST/berger 12-1/2” Single All Purpose Metric Measuring Wheel (Rolatape) RT312M CST/berger 12-1/2” Single All Purpose Metric Measuring Wheel (Rolatape) features a pistol grip for better measurement accuracy and a lightweight aluminum telescopic handle with convenient cradle. RT312M CST/berger 12-1/2” Single All Purpose Metric Measuring Wheel (Rolatape) features a precision molded tire and the aluminum spoke for heavy-duty construction and includes a kickstand to keep wheel up when not in use.