FIG. 1 is a perspective view of a handle body showing my new design; FIG. 2 is a second perspective view thereof; FIG. 3 is a top plan view thereof; FIG. 4 is a bottom view thereof; FIG. 5 is a first side view thereof; FIG. 6 is a second side view thereof; and, FIG. 7 is a third side view thereof. The broken lines showing portions of the handle form no part of the claimed design.