[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", compared to general 2-edge drills, it is possible to drill a hole that is closer to a perfect circle, allowing smoother insertion of anchors. ●By adopting a "cutting 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 than a general 2-edge drill, allowing smooth anchor insertion. It reduces the burden on the worker 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.