Finally! A way to secure your fancy rhinestone to your project! Simply place your brooch stone in the top and secure it with the prongs, then you can sew through the holes on the back to securely attach your stone to your project. Now you can have the sparkle and dazzle of the beautiful fancy stones on your clothing, horse tack, belts, handbags, hats, etc..... This set holds Swarovski 4928 18mm.