Keyhole hanger insert
thingiverse
These tools perform well when there's no keyhole drill available, or in instances where the project is relatively thin-walled. They have an impressive 5mm of depth and feature holes drilled out using a substantial 1 1/8 inch forstner bit. To increase their versatility, a blank insert has been added to facilitate the use of velcro or adhesive-backed hanging strips.
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