With WALLDOG, picture hanging is made easy with your ability to install into drywall, plaster, wood studs, metal studs, brick and concrete. Parts are ideal for hanging pictures, decorative shelves, and a variety of light weight items. The WALLDOG is a one-piece screw anchor with aggressive threads allowing for a stronger hold than traditional screws. These screw anchors are removable, reusable and no pre-drilling is required in drywall and plaster.Useful for heavy-duty fastening / anchoring applicationsPenetrates wood and metal studs with no pre-drillingHigh-quality steel constructionWhite painted head ensures that the anchor blends with mating material & decorHi-Lo thread type offers easier penetration and more secure hold in mounting materialHolds up to 50 lbs. 1/2-Inch drywall, 175 lbs. 4000 psi concrete, 95 lbs. brick75 pieces per package