[Features]●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. ● A "marking groove" is applied to the spiral, and it is used as a guideline when marking the drilling depth. ●It is the best drill for pilot hole drilling of Sanko Techno Co., Ltd. anchors. ●By making the cutting edge "4-edge", it reduces the catching on the rebar, reduces the burden on the worker, and enables smooth drilling. ●By adopting a "blade edge pocket", chips accumulated in the hole can be discharged efficiently, improving drilling work.