SEBSON Magnetic Pads/Magnet fixing for Smoke Alarm, Attachment for Smoke Detectors, adhesive : Amazon.co.uk: DIY & Tools
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Double-sided adhesive pad for smoke alarms
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No Drill Magnetic Mount Fitting All Smoke and Carbon Monoxide Detectors, Magnetic Plate with Adhesive Backing, Mount with no Screws | 4pcs : Amazon.co.uk: DIY & Tools