These fits in standard 5mm (aka 1/4") shelving holes and do their job well! Purposefully (and needfully) designed so that you can use normal 1 ¼" drywall screws and not blow-through thin shelving, this should save you an irritating hardware hunt through dubious drawers not touched in years for short screws.
**Update, I added an angled screw hole that might work best if your work area is too small to get a screwdriver/drill in horizontally.
*F3d file included for the daring and willing.
Print as imported without support for optimal strength. I suggest 3+ perimeter walls.
You might like my other bathroom models, check out my collection