The ornamental design for a benthead of a pneumatic tool, as shown and described.
FIG. 1 is a perspective view of a bent head of a pneumatic tool showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof;
FIG. 8 is a reduced perspective view of the bent head of a pneumatic head in use; and,
FIG. 9 is another reduced perspective view of the bent head of a pneumatic head in use.
The broken lines showing the pneumatic tool in FIGS. 8 and 9 represents the environment in which the design resides and forms no part of the claimed design.