Home | Burr Oak Tool Inc. Burr OAK Tool Inc. designs and produces high quality fin dies, fin lines, tube expander, tube cutoff machines, tube bending equipment, and coil forming units for companies in more than 75 countries. Burr OAK Tool Inc. designs and produces high quality fin dies, fin lines, tube expander, tube cutoff machines, tube bending equipment, and coil forming units for companies in more than 75 countries.