Drill size: 5 extra-long triangular drill bits in the set: 2 x 6mm, 1 x 8mm, 1 x 10mm, 1 x 12mm.Excellent Drill Bit: The double-edged blade helps to remove waste effectively and the 3-shank flat shank can firmly fix and stably the drill bit in the electric drill. Wide range of uses: This drill bit can help you drill easily, not only for wood, plastic, glazed tiles, old tiles, concrete, ceramics , ceramic tiles, bubble tiles, red tiles, but also for iron, copper and aluminum alloys. materials. There is no need to add water during the drilling process, which solves all drilling problems for you. Wear-resistant, practical and durable: Properly used, these drill bits will help you will provide a clean, precise hole so you can install them safely. The professional carbide tip is designed to quickly penetrate the hardest materials.Safe shopping: If you find any quality problems with our products, please contact us, we are ready to give you a full refund. Buy with confidence! ! !