This 9mm Radius Bead Roll Set is designed for JS Tools Bead Rollers but also works with other machines that use 20mm shafts and a 2-inch shaft center-to-center distance. This roll set will produce an 18mm wide round bead profile. Recessed attaching bolts give maximum clearance for complex parts. JS Roll Sets are designed to mix and match to create thousands of different shapes and effects in your material.