Parameter Information: Material: Nylon + Zinc Steel Color: White Tube Outside Diameter: 10mm Inner Diameter of Tube: 4mm Screw Diameter: 3.5mm Suggested Matching Drill Bit: 8mm / 10mm Product Description: Product Name: Expansion Tube Rubber Plug Screws Features: - The anchor is made of nylon plastic, which is highly insulated, resistant to wear and tear, and not easy to age. - The screws are made of zinc steel with a galvanized surface to resist rust and corrosion. - These drywall anchors and screws are perfect for hanging shelves on drywall. They are also great for any project, from hanging pictures to installing cabinets. - Wide range of application, they can be used on hollow substrates such as hollow brick, gypsum board, cement fiber board, wood, etc., as well as solid brick and concrete. Using method 1. Drill the hole; 2. Clean the hole and embed the anchor bolt into the hole; 3. Tighten the anchor bolt; 4. Finish and start using. Place of Application: - Hollow bricks, gypsum board, cement fiber board, wood and other hollow substrates, also suitable for solid bricks and concrete. Product Weight : 50 G / 1.76 Ounces Product Dimensions (L*W*H) : 100*50*30 MM / 3.94*1.97*1.18 Inches Package Weight : 55.0 G / 1.94 Ounces Package Dimensions (L*W*H) : 104*55*35 MM / 4.09*2.17*1.38 Inches Retail Packaging: Yes, Plastic Packaging Package Include: 50 x Drywall Anchor Kits