Plug No: Circumference below the holes in concrete and slash. For a clean installation: Installation with tightening mounting near objects to win material around the edges and corners will not damage any installation. Mountain has haiandoro-: Concrete and sharp. The screws through the diamond cut notches cut pile with a heavy duty screws and screws, cant help it to perform a perfect fastening screw mount for smooth and excellent workability and holding power. Use to remove the saddle, Plumbing, Wiring Switch Box, control box, mortar, concrete, block, brick, wood, etc. For a lighting fixture, bulletin boards, air conditioning equipment, warning devices, door frame, or the mounting of the shelf, seat, etc. Can be used. VISIT. iifas. JP