Not every wrist is the same size. Using jigs helps you complete your projects with a quality finish by holding them in place making those projects much easier to do with less hassle. No more guess work as the etched measurements help you determine appropriate lengths or sizes when working on your projects. Paracord bracelet jigs come with common size buckles that you can use to keep your bracelet project in place making weaving fun and easy. Use uncommon buckles? Simple unscrew the existing buckles on the jig & replace with an extra set of your own.