304 Stainless Steel Magnetic Clasps with Glue-in Ends, Ion Plating (IP), Barrel, GoldenSize: about 8~10mm wide, 15mm long, hole: 5~6mm.Excellent for bracelets or necklaces making. They have a great strong magnet which can help to connect your favourite necklaces or bracelets. This is a very easy design and must bring your jewelry more personal feeling. These are great for people who struggle with normal Clasps, Ion Plating (IP)!