Features NEAT AND WEAR RESISTANT: Core drill bit bring neat and opening, no broken edges, no need to add water, of sharpness and wear resistant LONG SERVICE LIFE: Thicken emery coating, the coating is uniform, the wear resistance and the life of hole opener are improved, which means that this products are of higher quality and can drill deep holes stably EASY DRILLING: Combining the sharpness of a glass hole saw with the durability of a sintered hole saw, hard tiles and marble can be easily drilled LARGE TORSION AND CORROSION RESISTANT: M14 screw design, handle can prevent slipping, possess large torsion, high bearing capacity. Using aluminum box for preservation, rust proof and corrosion resistant, possess and high end appearance FOR MANY SURFACES: M14 brazed mouth angle grinder is made of fine natural powder, suitable for marble, glass, tile Feature: 1. NEAT AND WEAR RESISTANT: Core drill bit bring neat and opening, no broken edges, no need to add water, of sharpness and wear resistant 2. LONG SERVICE LIFE: Thicken emery coating, the coating is uniform, the wear resistance and the life of hole opener are improved, which means that this products are of higher quality and can drill deep holes stably 3. EASY DRILLING: Combining the sharpness of a glass hole saw with the durability of a sintered hole saw, hard tiles and marble can be easily drilled 4. LARGE TORSION AND CORROSION RESISTANT: M14 screw design, handle can prevent slipping, possess large torsion, high bearing capacity. Using aluminum box for preservation, rust proof and corrosion resistant, possess and high end appearance 5. FOR MANY SURFACES: M14 brazed mouth angle grinder is made of fine natural powder, suitable for marble, glass, tile How to Use: 1. Fasten firmly and correctly on the angle grinder. Turn on the angle grinder and let the bit spin in the air to check for balance issues. 2. Place the drill bit at an angle of 15‑45 degrees and drill down gently at an oblique angle. 3. When drilling about a semicircle, gradually raise the bit to the upright position, continue drilling and shake the machine slightly. Specification: Item Type: Hole Saw Kit Material: Diamond Color: Golden Hole Diameter: Approx. 25mm Package List 4 x Diamond Drill Bit 1 x Aluminum Box 1 x User Manual