Irwin 10506628 Blue Groove Drill Bit x6 Pc Set The Irwin 10506628 Blue Groove Drill Bit x6 Pc Set is ideal for using on wood with an auger drill - offering 6x faster penetration than a standard flat bit. FEATURES Tapered flute for less binding and ease of use Cutting spurs – for clean holes with minimal ‘break out’ Steel material ‘Tri-Flute’ design for faster chip ejection Full length heat treated for extra durability Compact 165mm length designed to fit between studs in most common applications 1/4” Quick change shank for easy removal & replace CONTENTS 1x 16mm x 165mm Drill Bit 1x 18mm x 165mm Drill Bit 1x 20mm x 165mm Drill Bit 1x 22mm x 165mm Drill Bit 1x 25mm x 165mm Drill Bit 1x 32mm x 165mm Drill Bit