The ornamental design for a utilityknife handle, as shown and described.
FIG. 1 is a front perspective view of the utility knife showing our new design, wherein the broken line shows the blade holder in a fully opened position;
FIG. 2 is a side elevational view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a front elevational view thereof;
FIG. 5 is a back elevational view thereof;
FIG. 6 is another side elevational view thereof;
FIG. 7 is a bottom plan view thereof;
FIG. 8 is a top plan view thereof, wherein the broken line shows the blade holder in the half folded position; and,
FIG. 9 is a top plan view thereof, wherein the broken lines show the blade holder in the fully folded position.
The broken line showing the blade holder and the blade is included for the purpose of illustrating environment and forms no part of the claimed design.