I use these on seed bead bracelets. I have also used safety chain with them as long sleeves can sometime cause them to pull apart.
I love it! It is a life-saver! I could not get my bracelet fastened without it. Works like a charm and looks very pretty.
The magnets hold well and they look good. I use the 6mm and 8mm in various colours for bracelets, the 10mm size for necklaces.
Very nice, very classy looking. Appears to be strong, but I always use a safety chain when working with a single magnetic class. Time will tell how the finish holds up.