I wanted a chain linked bracelet but wanted a way to take it on and off easy. This clasp has a hole for 2 1/8in x 1/8in neodymium magnets and clip right into either end of the bracelet. Bonus cat pictures. I used magnets I found on amazon, BYKES brand neodymium magnets size 1/8th inch by 1/8th inch. The tolerance is sorta tight, I had to drill a bit to get some debris out of the hole but the magnets fit great and snug so they wont fall out.