Features Applicable substrate: gypsum board, insulation board, lightweight brick. High-quality materials: made of carbon steel and galvanized treatment. Expansion design: When you screw in the screw, our rib anchors will expand, thereby increasing its holding force. The tapered tip is easy to install. The sides are serrated, so that the metal anchor provides greater grip. Wide range of applications: the hammer is fixed on drywall, gypsum board, wallboard, slate, and medium weight application of gypsum board. Easy to use: Compared with other plastic wall anchors, ours are easy to use, and the damage to the wall is less. No need to drill or drill holes. More importantly, they can be easily removed for reuse without leaving large holes in the wall. The anchor can hang 66 pounds. Features: Applicable substrate: gypsum board, insulation board, lightweight brick. High-quality materials: made of carbon steel and galvanized treatment. Expansion design: When you screw in the screw, our rib anchors will expand, thereby increasing its holding force. The tapered tip is easy to install. The sides are serrated, so that the metal anchor provides greater grip. Easy to use: Compared with other plastic wall anchors, ours are easy to use, and the damage to the wall is less. No need to drill or drill holes. More importantly, they can be easily removed for reuse without leaving large holes in the wall. The anchor can hang 66 pounds. Wide range of applications: the hammer is fixed on drywall, gypsum board, wallboard, slate, and medium weight application of gypsum board. Specifications:  Material: carbon steel and galvanized treatment Size: 12*30mm Package includes: Expansion screw sleeve x 50pcs Screw x 50pcs Package List