The ornamental design for a hexagonalriggingblock, as shown and described.
FIG. 1 is a perspective view of a hexagonal rigging block showing my new design;
FIG. 2 is a front view of the hexagonal rigging block of FIG. 1;
FIG. 3 is a rear view of the hexagonal rigging block of FIG. 1;
FIG. 4 is a left side view of the hexagonal rigging block of FIG. 1,
FIG. 5 is a right side view of the hexagonal rigging block of FIG. 1,
FIG. 6 is a top plan view of the hexagonal rigging block of FIG. 1; and,
FIG. 7 is a bottom plan view of the hexagonal rigging block of FIG. 1.
The broken line showing of additional rigging pieces is for the purpose of illustrating environmental structure and forms no part of the claimed design.