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Amazon.com: 1st Choice Magnetic Button Clasp Snaps - Purses, Bags, Clothes - No Tools Required - Choose Small or Large Magnetic button size: 18mm
Anpro 120 Pcs Strong Ceramic Industrial Magnets Hobby Craft Magnets-11/16 Inch (18mm) Round Magnet Disc for Refrigerator Button DIY Cup Magnet Craft Hobbies, Science Projects & School Crafts: Amazon.com: Industrial & Scientific
Amazon.com: Blue Magnetic Power Buttons by Würkin Stiffs | Pack of 8 | Replacement Magnets for Power Stays | Magnets for Collar Stays in Storage Case | As Seen on Shark Tank :
Amazon.com: HEALLILY 24pcs Magnetic Round Snap Button Name Badge Magnet Clasp Fastener Brooch Pin Scarf Clasp Name Tags 17mm Silver : Arts, Crafts & Sewing
Amazon.com : Tracking in and Out Biometric Fingerprint/RFID/PIN Access Control System with 600LBS Force Electric Magnetic Lock + 110-240V Power Supply+RFID Cards+ Keyfobs+Exit Button : Electronics