The ornamental design for a benchblock, as shown and described.
FIG. 1 is a front, top, right-sided perspective view of the bench block according to the claimed design;
FIG. 2 is a top view of the bench block according to the claimed design;
FIG. 3 is a front, rear, left and right side view of the bench block according to the claimed design;
FIG. 4 is a bottom view of the bench block according to the claimed design;
FIG. 5 is a side view of the two parts of the bench block according to the claimed design; and,
FIG. 6 is a perspective view of the two parts of the bench block according to the claimed design.
The ornamental design which is claimed is shown in solid lines in the drawings. The broken lines in the drawings are for illustrative purposes only and form no part of the claimed design.