Our CRL Plastic Toggle Anchors are easy-to-install, and deliver dependable holding power in hollow walls with 2X4 studs, lath and plaster. They accept #8 through #12 size sheet metal or wood screws, and there are two sizes to accommodate hollow walls from 1/2" to 5/8" (12.7 TO 15.9MM) thick. The wings, when fully spread, will prevent pull-out, even under heavy loads.