The Irwin Speedbor is a popular line of drill bits known for their speed and efficiency when drilling holes in wood.
Diameter        Total length (L2)   Shank diameter (d)  Â
- ⌀08mm           152mm                 1/4 inch
- ⌀10mm           152mm                 1/4 inch
- ⌀12mm           152mm                 1/4 inch
- ⌀13mm           152mm                 1/4 inch
- ⌀14mm           152mm                 1/4 inch
- ⌀18mm           152mm                 1/4 inch
- ⌀19mm           152mm                 1/4 inch
- ⌀20mm           152mm                 1/4 inch
- ⌀22mm           152mm                 1/4 inch
- ⌀24mm           152mm                 1/4 inch
- ⌀25mm           152mm                 1/4 inch
- ⌀28mm           152mm                 1/4 inch
- ⌀30mm           152mm                 1/4 inch
- ⌀35mm           152mm                 1/4 inch
- ⌀38mm           152mm                 1/4 inch
- ⌀40mm           152mm                 1/4 inch