Router Bit heads are available in 5 widths of 4mm, 5mm, 7mm, 9mm and 11mm depending on the thickness of each leather edge. Each has a gentle angle for ideal tanning. It also comes with an easy-to-use cylindrical and conical bit. You can also use this topper polishing router bit that took time to get your work efficiently. Leatherwork is much more fun. Get your original work as a beautiful finishing prop!