Metal toggle bolts can support heavy loads (25 pounds to 50 pounds) in drywall, plaster and hollow-core concrete block. Plastic versions hold medium loads (10 pounds to 25 pounds) in drywall and plaster.
How to use them: Bore a hole in the wall large enough to accommodate the toggle. Fit the item to be anchored over the bolt, then insert the toggle and tighten. You can trim a plastic bolt flush with its nut after installation.