The Wall Twister® is an all steel, single piece screw anchor manufactured with a unique deep cutting thread design, its suitable for fastening objects into drywall, wood, concrete, plaster, brick, and block walls. The patented reverse serrations under the head prevent over-torquing. When working with masonry-based materials, use the 3/16 carbide tipped drill bit included in the kit to create a pilot hole. When fastening into drywall or wood, no pre-drilling is required. Typical applications include HVAC fixtures, signs, telecommunications equipment, plumbing fixtures, and many more. It features All Steel Single Piece Screw Anchor, Reverse Serrations Prevent Over Torquing, Heat Treated Point, High Profile Threads, Resists Wobble/Stripping, Can Be Removed. Material is AISI 1018 Carbon Steel.