The concrete hole saw kit features a 110mm (4.33-inch) cutting diameter, making it perfect for drilling through materials like cement, brick, concrete, adobe, and stone. Made of durable tungsten steel and cemented carbide, the hole saw is designed for high-efficiency drilling with ventilation holes to remove dust. The kit includes 1 drill bit, a round handle (220mm), a center positioning drill bit, and 2 fixing screws. It s widely used for tasks such as drilling walls and installing pipes. With reliable Xdovet customer service, your satisfaction is guaranteed.