Irwin Straight Shank Zinc Carbide Tipped Rotary Drill Bit 1/2 x 4 L in.

2X longer life than traditional masonry bits
Maximized flute for faster, more efficient dust removal
2X more carbide in tip for 2X longer drilling life in rebar-reinforced concrete
Optimal groove design minimizes friction for increased speed and longer life
Blue power ring for easier identification in the toolbox
Premium steel improves core strength for maximum durability and extended life