Powers poly toggle anchors fold up to fit into the hole, then spring open to provide a secure strong attachment point in drywall or other 5/8" thick hollow walls. You can use these with a variety of screw sizes, from #6-#12. You need a 5/16 drill bit, btw. 

Also can be used in solid walls, you can just cut off some of the springy wing. 

You'll get a bag of 20 poly toggles, feel free to check my other listings for screws.

please ask any question you have before you buy and I'd appreciate positive feedback if you're satisfied. thanks!