You can make your own buttons for clothing. Any flatback embellishments now can be your fancy buttons for anything. For Clay button, Pearl button, any flatback items..More ideas?..Also can be used for ponytail holder too. Just apply some glue(Krazy glue and E6000..) on the back of this shank and attach to the flatback. And slide a pony O ring into the hole and tie it.Small Shank--Size of shank ..8mmX6mm(H)Thickness of shank base..1mmLarge Shank---Size of shank ..12mm X 6mm(H)Thickness of shank base..2mmSize of hole..4mm(enough to put 2mm thickness of pony O elastic ring) (Picture is a comparison to smaller size .)