Picture frame hook stand-offs

New and improved version! Useful if you've got a box picture frames that expect you to hang a nail 30mm out of your wall. Adding a wire is a pain, and if you hang it by the frame itself it warps under the weight. Either just CA glue this to the inner rear surface, or use the screw version (with 3mm screws) if you're super cautious about how much load the glue will bear. 13mm, 23mm, 33mm versions included.