Keyhole Fittings-Select either single or double

I purchased 30 pairs of the 5/8" x 1-21/32" size for making MDF sign blanks for a local artist. As other reviewers indicated, these need to be recessed 1/8" in order to be flush with the surface that goes against the wall. I recommend making a router template for creating the recess. If a flat head screw is used for hanging, then you don't need to do any additional routing. If a button head screw is going to be used though, as part of a drywall anchor system for example, then you'll want to recess the area underneath the keyhole an additional 1/8" to allow clearance for the bigger screw head. Also note that these fittings include screws for mounting. I don't think that information was included in the product description.

Worked great to hang a small shelf. The pieces are well made and it seems to be heavier duty than using a keyhole bit in a router to make the slot. Thickness of the piece is 1/8" including the flared part. I mortised on my drill press with a 5/8" forstner bit and cleaned up with a chisel. I was only installing two of these at the time. If I were using very many I would make a jig for my router for the mortising. A smaller hole must be drilled in the center of the workpiece to allow space for the screw head that this piece hangs on. The mortise has to be 1/8" deep minimum for this piece to sit flush with the surface. It won't hurt to go a little deeper as the screw the piece hangs on can be adjusted. The screws for attaching this piece are just shy of 5/8" long, so they would have to be shortened or changed if your workpiece thickness is much less than 3/4".