Item Type: Expansion Screw Eye Plate Set Material: Steel Purpose: Rescue, escape Pull Force: 25KN Expansion Screw Size Diameter: Approx. 12mm/0.47in Length: Approx. 98mm/3.86in Package List 1 x Safety Screw Bracket 3 x Expansion Screw 1Durable Material: All parts are made of heavy duty steel, suitable for escape rope safety rope fixing. 2Multifunctional: Eye hook expansion screw set can be installed in various masonry, solid concrete, bricks or blocks. 3Strong Bearing: Tripod bracket hooks and screws can bear a maximum load of 25KN. 4Uniform Strength: The triangular shape bears the force uniformly, and the bottom groove makes the stress point close to the wall, which can be kept for a long time for use. 5Demension: The expansion screw diameter is 12mm and the length is 98mm. A 12mm drill bit is required for installation and drilling.