Function: 1 CARBON STEEL: These self-drilling screws are made of premium carbon steel material which guarantees high hardness and sharper thread. 2. Impact Resistant: When screwed, the ribbed anchor splits on the two opposite sides for added holding power. Continuous folding, toughness, shock resistant. 3 STRONG ENGAGMENT: Deep thread design provides a strong engagement on plaster wallboard and can hang up to 66 pounds. 4 No Drilling or Holes: No holes or drilling required. Easily remove screws and items and leave anchors on the wall for reuse. No holes on the wall after use. 5 SUFFICIENT QUANTITY: Package includes 50 sets of self-drilling anchor screws to meet your different needs of TV, bicycle, shelf straps, cabinets, and decorations. How to use: 1 Drill a hole in the wall first. The punch depth and diameter must correspond to the size of the product. 2, hammer the anchor into the wall with a hammer. 3, The anchor is aligned with the hole to match the size of the wall anchor. 4. Insert the screws and twist clockwise. 5. Screw wall anchor. Specifications: Item Type: Self Drilling Anchor Screw Material: Carbon Steel Surface Technology: Zinc Plated Purpose: Self-Drilling Anchor Screw Length: Approx. 28mm / 1.10in Drywall Anchor Length: approx. 30mm / 1.18in Package List: 50x Screws 50x Anchors