These devices mount glass to wood. The grooves in the bottom allows glue to hold the mount to the wood better. The holes allow nails or tacks to reinforce the bond. I created this mount to attach a piece of fused glass to the bottom of a Crokinole board (as seen in the images).

These mounts are printed without supports and can be printed in 20 minutes. These come in 4 sizes for 4 thicknesses of glass; 5mm, 6mm, 7mm, and 10mm glass.