The blade tip is made with 4 edges, so it can be drilled closely to a real circle compared to other 2-edge drills, making the anchor insertion smoother. Optimizes the blade tip and spiral design to improve the hole speed compared to conventional products. This drill is ideal for drilling holes made by Sanko Techno Co., Ltd. The blade is made with a 4 edge, reducing the burden on the worker. Now you can spare. Marking grooves are used for marking the depth of the holes. Material for machining: concrete, block, mortar. Blade diameter: 0.6 inches (16.5 mm). Compatible models: lightweight hammer drill. Total length: 7.9 inches (200 mm). Effective length: 5.5 inches (140 mm). Shank: SDSplus. Soft vinyl case. Blade: Carbide chip.