By optimizing the edge of the blade and spiral design, it achieves improved perforation speed compared to conventional products. The blade edge is made to "4 edges", so it can be drilled close to a true circle when compared to other 2-edge drills, and the anchor is inserted. The use of the blade pocket and the 4-joint grooves allow for efficient discharge of chips that accumulate in the hole and improved drilling. The blade edge is made to "4 edges" to allow for more precise holes compared to typical 2-edge drills and anchor inserts smoothly. Reduces snagging on the rebar, reducing the burden of the worker, and allows for smooth perforation. The spiral marking grooves are applied at 1.6 inches (40 mm) intervals to mark the depth of the holes. Blade diameter: 0.7 inches (18 mm); Effective length: 11.8 inches (300 mm); Total length: 17.7 inches (450 mm); Shank: SDSmax; Weight: 1.2 lbs (0.550 kg); Compatible models: Hammer drill; Material: Body: Alloy; Blade: Carbide chip; Body: Alloy; Applications: Concrete, mortar, block