Toggler, 20 Pack, 3/8"-1/2", TB Hollow Wall Anchors With Screw, Patented Mechanism Provides Secure Holding Power For Light & Medium Loads, Key Activated Locking Action Makes The Anchor A Rigid, Weight Distributing Truss In Hollow Walls, Providing Maximum Security In The Smallest Possible Hole, Can Be Used In Drywall Or Plaster Walls & In Hollow Doors Or Thin Panels, Accepts Any Type Wood, Sheet Metal, Or Stainless Steel & Size Of Screw From #6 Through #14.