Industrial brad point boring bits are coated with a non-stick coating for longer lasting cutting edge and tool life.Amana tool dowel drills are coated with a special polytetrafluoroethylene (PTFE), a non-stick color coating. In cases where the carbide tip cutting edges are coated, there is No need to sand the coating off before use. Once the tool starts drilling, The coating is cleared off the needed cutting edge right away, #301005, (B) Cutting height: 27mm, (D) diameter: 5mm, (D) shank: 10mm, Overall Length (L): 57mm, rotation: left hand301005 carbide Tipped brad point boring bit L/H 5mm DIA x 57mm long x 10mm Shank