Action set with 8 Alpen drill bits, consisting of 3 C Protector drill bits for drilling in very hard stoneware, porcelain and glass with a diameter of 6 mm, 8 mm and 10 mm and 5 PM-5 universal drill bits with a diameter of 4 mm, 5 mm, 6 mm, 8 mm, 10 mm. Drill bits from the C Protector series enable precise drilling without burrs and cracks, even in the hardest stoneware tiles. They require no cooling during drilling and can drill at speeds of up to 600 rpm. The PM-5 universal drill bits are designed for precise and fast drilling in many different materials, such as Wood, plywood, plastic, ceramic tiles, soft metals and steel.