The WallGripper is the only expandable screw-in anchor on the market. It expands and grips behind drywall and its twice as strong as a regular screw-in anchor. Patent designed to offer you the ultimate holding power without any pre-drilling: A unique body design with 4 expandable wings that grip tightly behind drywall to offer you the ultimate holding power. A fine centered point that helps guide the anchor into the wall with flawless precision. A sharp cutting edge that reduces the force required to cut the material. A hollow body cavity to remove excess material and create a cleaner cut. Also a sharp profile thread that cuts deeply into the hole to ensure ultimate holding power and stability.