We claim the ornamental design for a single hole swivel clamp, as shown and described.
FIG. 1 is a perspective view of a single hole swivel clamp depicting, in part, the new, original and ornamental design thereof.
FIG. 2 is a perspective view of the single hole swivel clamp showing the underside thereof.
FIG. 3 is a right side elevation view of the single hole swivel clamp of FIG. 1.
FIG. 4 is a left side elevation view of the single hole swivel clamp of FIG. 1.
FIG. 5 is a front elevation view of the single hole swivel clamp of FIG. 1.
FIG. 6 is a rear elevation view of the single hole swivel clamp of FIG. 1.
FIG. 7 is a top plan view of the single hole swivel clamp of FIG. 1; and,
FIG. 8 is a bottom plan view of the single hole swivel clamp of FIG. 1.
The broken lines in the drawing figures depict environmental structure or portions of the single hole swivel clamp for illustrative purposes only, and form no part of the claimed design.