Hollow wall anchors are for hanging anything heavy on an otherwise weak wall. They attach to the back of the drywall with little legs, so they are more secure than normal nails or screws. Hollow wall anchors are used for medium-duty applications and come with pan heads, or more rarely, hex heads. These types of anchors expand as the screw is tightened and driven into the cavity. This anchor can be installed using a hammer or a drill and can be used with various wall thicknesses. These anchors are also sometimes known as Molly® bolts because that’s the name of the company that originally made them. Some have a conical point and are called drive-type, but most don’t have that.