IMPORTANT NOTE: PLEASE READ THE SUMMARY, IT CONTAINS INFORMATION ON THIS MODEL. This is a ring that you wear with a claw attached to it. This is the perfect addition for any costume that uses claws, as these claws allow you to perfect your halloween costume, while also leaving you hands free to do normal things. In other words,l designed these claws with only one ring at the bottom so that they can be worn easily. When I was wearing them, I still could do quite a bit of normal hand activities. That's why these claws are great, they do not hinder any hand movement at all, look cool, and can still be controlled using the portion of your finger, closest to your hand. Now, since it is impossible for me to determine exactly what anyone's hand size would be, I have included files with different sizes of ring. There is a 17mm ring, 19mm ring, 21mm ring, 23mm ring, and a 25mm, ring, the files for these different rings however are called 17mm Claw, 19mm Claw and so on. THIS IS REFERRING TO THE RING SIZE!! I think that this should be enough to fit most people's fingers. Just measure how big each of you fingers are, and choose the according files to match each of your fingers.