Hooks can be used on plaster, drywall or shiplap walls. This refers to the picture hanging hardware that attaches to the back of the frame. Most picture frames come with hooks, hangers or wire attached. Knowing what is attached to the artwork will help determine the right hooks. Different types of picture hanging hardware have different weight-bearing capacities. As a rule of thumb, choose wall hooks that can hold the exact weight of the item being hung or more.30 lb. hooks for wall clocks and lightweight picture frames.50 lb. hooks for mirrors and heavy-duty picture frames.100 lb. hooks for wood plant hangers and extra heavy-duty picture frames.