Faithfull Multi Construction Drill Bits are suitable for use in most materials encountered in the building industry. They can be used on brick, tile, concrete, metal, aluminium, wood and plastic, and are ideal for multi-layer materials. The diamond-ground carbide tip has advanced performance cutting edges for a long working life and the flute is designed for fast debris removal. Perfect for use in cordless drills when used on both rotary or hammer modes, dependent on the material being drilled (4mm bit rotary only). This 7 piece Faithfull Multi Construction Drill Set contains sizes: 4, 5, 6, 7, 8, 10 and 12mm.