Detailed Product Description Spec:56×56×16.2mmAvoirdupois:26gBattery:AABattery Life:12 monthsTime Keephg:+ -0.5 Second/DayShaft Length:12mmTorque:≥300μN.MPower Consumption:≤250μAMeasures Of Carton:37×37×36CMQuantity:500pcs/ctnShaft length withs crew:11,12,13,16.5,18.5,20,28(mm)