d-ring picture hangers 4

https://3dceau7tng.birchreport.com/posts/choosing-the-right-picture-frame-hardware-for-a-secure-level-hang

D-ring picture hangers have these little metal loops on the back that let your frame hang level on a couple of nails. They're pretty strong, so they work well for medium and large frames, and they take the weight better than those plastic sawtooth hangers that can bend. You just screw them into the frame's sides and then hook the wire or bracket onto your wall nails. It's a solid, no-fuss way to hang things straight.