【Suitable for 4-inch Tile Hole】The hole saw diameter is 4-1/8 inches (105mm), suitable for 4-inch tile hole. It has a larger cutting diameter, making it more efficient and convenient to use. 【Pilot Bit Included】The 4 1/8" tile drill bit includes a pilot bit, which is used to guide the saw blade into the material and prevent it from slipping. It ensures precise and accurate cutting. 【3/8 Inch Shank】The 4 1/8 inch diamond hole saw is equipped with a 3/8 inch triangular shank, which is compatible with most drill machines. It can be used with a variety of drill, allowing for more flexible and versatile cutting. 【Premium Diamond Saw Blade】Made of high-quality industrial diamond, the saw blade is sharp, with a longer service life than traditional saw blades. It is suitable for cutting porcelain tile, granite, ceramic, marble, glass, and stone. 【Wide Application】The 105mm diamond hole saw is suitable for various occasions, such as home decoration, tile installation, and stone cutting. It can be used to cut holes for faucets, shower heads, exhaust fans, and other household appliances. This 4 1/8" Diamond Hole Saw with Pilot Bit is perfect for cutting tiles, porcelain, granite, ceramic, marble, glass, and stones. It features a high-quality diamond saw blade with a diameter of 105mm and a depth of 1 3/8", making it suitable for a variety of applications. It also comes with a pilot bit for precise and easy hole cutting. With its good construction and sharp cutting edges, this hole saw is a reliable tool for any DIY project or professional contractor.