Jog handwheel is used when the tool of CNC machine needs accurate location. It is hard to make a precise location by machine control. At this time, handheld encoder will be operated by hand to control tools’ moving path. The handheld encoder is an important part for CNC machine tool. The macro movement is necessary for processing precise piece. Roundss provides 3 types of 80mm jog handwheels. The mounting dimensions are the same. Sliver metal housing, black metal housing and plastic housing are optional for the handheld encoder.