HARFINGTON 2pcs Diamond Drill Bits 10mm Serrated Hollow Core Hole Saw for Glass Ceramic Porcelain Tile Marble Stone - hta220803hh0665

• Size - Drilling diameter: 10mm / 0.39". drilling depth: 30mm / 1.18". round shank diameter: 6.5mm / 0.26". total length: 50mm / 1.97" Material - Using electroplated diamond (50-60 grits), the opener creates precise, smooth cuts with no broken edges. Nickel plating improves hardness, wear resistance, corrosion resistance, and greatly extends the drill bit life. Features - The serrated drill bit increases the sharpness and opening speed. Sharper and more durable than ordinary electroplated drill bits, especially suitable for thick glass openings. (10mm thick glass generally has about 300 openings.) Applications - Widely used for cutting accurate holes on glass, ceramics, porcelain, ceramic tile, porcelain tile, limestone, slate, marble, light stone and fiberglass. Not suitable for drilling tempered glass, plastic and wood. Use on ordinary hand drills or bench drills. Notice - Always work with coolant (water) when drilling. Start your hole diagonally, make a round trace and then hold drill straight. Use at low drill speeds and drill pressure. Not suited for use on concrete or for depths beyond about 1/2".