- 9-11 the working ends are 21 mm long. - #9 (D1=0.96 mm / D16=1.27 mm with a .02 mm taper) #11 (D1=1.2 mm / D16=1.27 mm). - DURALite® ColorRings™ Handle: 3/8”/9.5mm diameter that has a gradual taper from the tip to the grip. **For further product information, please contact Chat Support**