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No drilling,2 installation methods - you can use 3M adhesive, no drilling, no drilling, or permanent installation using screws. If you are not sure whether our products are suitable, you can search and select 1 package type first. I would personally recommend using screws for mounting, which is more durable. Sometimes 3M May damage the surface because the magnet works every day! 3M pads are intended for smooth/flat/dry surfaces, not for drywall/cement/latex paint walls and any uneven surfaces.