Picture Back Lock

thingiverse

The clips you mentioned keep the glass or picture securely in their designated spot inside a picture frame. When building one recently for a family member, I required these to get things right. These retainers attach themselves firmly to 18ga wire nails. To achieve this task, simply print and nail them into place within three minutes flat. Most printing settings should yield desired results, although I employed ABS material with a .3mm layer height and 25% infill for my project's needs.