【PAY ATTENTION TO】- Collision of concrete iron is strictly prohibited when used in concrete
【WIDELY APPLICATION】- Hollow square shank drill bit is for handling a wide variety of heavy-duty drilling applications including concrete; brick;block and more
【CARBON STEEL TIPPED BIT】- Carbon-tipped bit heads are harder, tougher and more resistant and durable to extreme loads for longer tool life and faster performance in masonry;Steel bits are heat forged for strength and longevity with a sharp Carbon Steel Tip edge design for maximum impact on
【FOUR-HOLLOW SQUARE SHANK】- Optimized 4-flute design to reduce bit stress when drilling;keep the bit running cooler;and for fast dust removal