[Features]●By optimizing the cutting edge and spiral design, the drilling speed has been improved compared to conventional products. ●By making the cutting edge "4-edge", it is possible to drill a hole that is closer to a perfect circle than a general 2-edge drill, enabling smooth anchor insertion. ●By adopting a "blade edge pocket" and "four grooves", chips accumulated in the hole can be discharged efficiently, improving drilling work. ●By making the cutting edge "4-edge", it is possible to drill a hole that is closer to a perfect circle compared to a general 2-edge drill, enabling smooth anchor insertion. It reduces the burden on workers by reducing catching on rebar, and enables smooth drilling. ●Marking grooves are provided on the spiral at intervals of 40mm to mark the depth of drilling.