Powers up to 12" hands and the use of a large sweep second hand is not recommended. Case Size: 2-1/4"W x 3-1/8"H x 1" Deep. The shaft diameter is 7/16". Made in USA. Requires 1 'C' Battery. Hands not included. This unit can use either "I" Shaft hands over 6" or "I" Shaft hands under 6". 1/2" dial thickness, 15/16" total shaft length The Dial thickness refers to how thick the material is that the shaft needs to go through. Total shaft length refers to the length of the shaft when measured from the movement body to the very tip. The threaded portion of the shaft is approx 1/8" longer then the dial thickness number. To View video of how to install this movement Click Here. To view this or any of our other how-to videos Click Here ...