The ornamental design for a utilityknife handle, as shown and described.
FIG. 1 is a right side perspective view of the utility knife with removable blade of the present invention showing my new design in an unfolded position;
FIG. 2 is a left side perspective view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is bottom plan view thereof;
FIG. 5 is a front elevational view thereof;
FIG. 6 is a rear elevational view thereof;
FIG. 7 is a right side elevational view thereof; and,
FIG. 8 is a left side elevational view thereof.
The broken lines show that the blade holder and blade are included for the purpose of illustrating environment and forms no part of the design.