Features: - 100% brand new and high quality. - The body of this drill bit is painted gold to prevent rust. < p>- Clean opening, smooth, no broken edges, no shaking phenomenon, chip easily. --Low incision resistance, stable drilling properties, high speed, no broken edge. - Mainly used for drilling porcelain tiles, ceramic tiles, marble, granite, reinforced concrete and other hard materials. --Ideal for drilling faucet mounting holes in stone countertops, plumbing pipes in showers and vanities. Application method: use wet or dry To extend the service life of use, water must be used for cooling and lubrication. The hole saw can be used with a bench drill or a manual electric drill. When using an electric hand drill, start moving slowly at a 45-degree angle to the vertical after making an initial mark. Specifications: Material: diamond metal Quantity: 1 piece Color: gold Tool holder type: triangular Cooling type (internal cooling / external cooling): internal cooling Cutting diameter: 5