The angle brackets feature two holes in them for screws. They are typically used to join a wooden shelf to a wall or to join furniture parts together.
8 x Metal Sofa Connecting Brackets Interlocking Joining Clips Hidden Concealed
4 x Metal Corner Sofa Beds Interlocking Connecting Clips Brackets with screws
8 Pcs Decorative Corner Brackets, 1.7"x1.7"x1" Metal Corner Protectors, Black
12Pcs Metal Corner Brackets for Wood4 Small,8 Large,with Screws/Screwdriver
4 Sets Decorative Corner Brackets 2.9"x2.9"x0.8" Metal Corner Protector Black
12pcs 1.8" x 1.8" x 0.8" L-Shaped Corner Bracket Stainless Steel with 48 Screw