DeWalt DT4615 Wood Auger Drillbit 22.0mm x 200mm

Threaded centre point to aid accurate drilling.
Outer cutting spur provides clean holes with less splintering.
Special Lewis spiral flute allows for fast removal of debris and rapid drilling.
Diameter 6 - 10mm cylindical shank, Diameters 12 - 32mm hexagonal shank.

Applications
Special wood bit for rapid, precise drilling.
Typically used for boring clean precise holes through beams, joists, doors etc.