Packaged in a case, the multi diameter alloy drill bit set ensures organized storage and portability while maintaining sharpness for repeated use on tough surfaces like stone and reinforced concrete This drill bits set features premium alloy tipped masonry drill bits with 5-16mm diameter options, durability and versatility for demanding concrete drilling tasks The round shank design ensures secure compatibility, minimizing slippage during high impacts drilling while optimizing power transfer for faster, cleaner boreholes Perfect for drilling anchors hole in concrete wall, installing electrical conduits in brick surfaces, or creating ventilation openings in stone structures at job site and home renovations Ideal for professional contractors, construction workers, and enthusiasts requiring rotary hammer drill accessories for heavy duty masonry projects, Manufacturer: PURPLELILY