Bedazzler or Gemagic compatible. Use with Bedazzler #30 or Gemagic #34 plunger and setter plate. The prongs are long enough for 1 layer of denim or double t-shirt fabric. If setting by hand you can use a small improvised tool such as the the eraser end of a pencil.You can also set these with the Allstarco GU50 rhinestone setter It's fun and easy to add BLING and glitz to your next project. Fabric goes face up over the setter plate. Position where you want to place the stud. Press down firmly until the prongs bend. The prongs pass through the top of the material and are folded over by the grooves in the setter plate, locking them onto the fabric from the back.The studs are made of a non rusting copper alloy and the prongs are easy to bend. Don't forget we also have an amazing collection of Bedazzler studs & nailheads that are also compatible with your Bedazzler or Gemagic Machine! All of them can be found here at our Allstarco USA Store!