No plug required! ❶ Cut into concrete with a small diameter bottom hole. Clean construction: The tightening process does not damage the attachments, and can be installed near the edges or corners of the material. High and low threads: High thread with diamond cut (cutout part) to cut the screw into concrete, and the screw threads provide a smooth and perfect tightening without any trouble. Rust resistant silver coated finish: Top class rust and corrosion resistance. Applications: For building materials such as concrete buildings, mortar, blocks, bricks, wood, and other applications, piping, wiring saddles, switch boxes, control boxes, lighting fixtures, bulletin boards, air conditioning equipment, alarm equipment, door frames, shelves, seats. www.iifas.jp