Faithfull Multi Construction Drill Bits are suitable for use in most materials used in the building industry. Manufactured for trade use but also makes a good all purpose drill bit for DIY users. They can be used on brick, tile, concrete, metal, aluminium, wood, plastic and are ideal for multi-layer materials. The diamond-ground carbide tip has advanced performance cutting edges for a long working life. The flute is designed for fast debris removal. Perfect for use in cordless drills when used on both rotary or hammer modes dependant on material being drilled. (4mm bit rotary only). Length 75mm Diameter 4mm