Alloy Magnetic Clasps with Glue-in Ends, Column, PlatinumSize: about 19~21mm long, 11mm wide, hole: 9mm.These Magnetic Clasps with Glue-in Ends are great for necklaces. Each end is magnetic so make sure to align magnets in correct position before completing your project. They are also for bracelets, just add to the end of your DIY bracelets crimp in the hole.