Concave Head Thumb Pin

FIG. 1 is a top perspective view of a concave head thumb pin.

FIG. 2 is a bottom perspective view of the concave head thumb pin of FIG. 1 .

FIG. 3 is a right-side elevation view of the concave head thumb pin of FIG. 1 . The left-side view, front view and rear view are mirror images of FIG. 3 .

FIG. 4 is a bottom plan view of the concave head thumb pin of FIG. 1 ; and,

FIG. 5 is a top plan view of the concave head thumb pin of FIG. 1 .