The plugs need to worry about. Circumference at the bottom of the holes in concrete and slash. A clean installation. Non-binding with installation for mounting near objects to win material around the edges and corners will not damage any installation. Screw Mount are haiandoro-. Sharp, smooth without the screws) with a heavy duty screw mount and the diamond cut (cutting notches, Mili, perfect concrete fastening to mount with screws, excellent workability and holding power. Rust resistant silver coated finish. No rust, 耐蝕 force is the top class. Application: concrete, mortar, blocks, bricks, wood, etc. For your commercial plumbing, wiring loom, saddle switch box, control box, lighting fixtures, bulletin boards, air conditioning equipment, warning devices, door frame, or the mounting of the shelf, seat, etc. Can be used. VISIT. iifas. JP