This concrete hole saw kit, with a cutting diameter of 105mm (4.13 inches), is a versatile tool for drilling through tough materials like cement, brick, and stone. It's ideal for wall drilling and installations such as water pipes and exhaust hoses. Made from tungsten steel and cemented carbide, it ensures durability and efficient drilling, with ventilation holes for dust removal. The package includes a drill bit, round handle, center positioning bit, and fixing screws. Xdovet offers excellent customer support for a worry-free experience.