This interchangeable paper rolling tool is perfect for rolling beads and quilling projects. You simply unscrew the top of the roller to open up the holder and insert the size rolling tip you want to use. Then you screw it until the tip fits snuggly in the holder and repeat the process when you want a different size. It includes 4 slotted tips in different sizes, making it 4 tools in one. The tips are small and some people may find it difficult to insert them into the roller. This is not a product defect. It is more of a learning curve for handling small parts.