[Features] ●It is possible to drill a hole close to a perfect circle, and the anchor insertion is smooth. -By adopting a cross blade on the cutting edge, it is possible to penetrate the deck plate. ●Because it is possible to drill a hole close to a perfect circle, anchor insertion can be performed smoothly. ●It maintains stable drilling performance with a cross blade that has less biting even when it hits reinforcing bars and less wear on the cutting edge and outer diameter.