Right angle bracket for three-quarter inch wood plank (full 3qtr) and the always a bit less than three-quarter plywood (thin 3qtr). Use it to hold planks of wood together while dry fitting, securing, or glueing together of lumber. The slots also allow for a tee joining planks or shelves in place. Countersunk holes on each side are for building something temporary with brackets and short drywall screws.
When not in use a pair can be nested together to take up a bit less space in the shop.
The author marked this model as their own original creation.