Element of a construction set toy

FIG. 1 is a top perspective view of my ornamental design for an element of a construction set toy;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a rear view thereof;

FIG. 7 is a front view thereof; and,

FIG. 8 is a left side view thereof.

The broken lines represent portions of the article that form no part of the claim.