Extremely high quality, durable and long life multi-purpose drill bits for drilling through all materials. Steep, aggressive u-type flute gives optimal waste removal, and a 120 degree diamond ground carbide tip for faster drilling and long life even in hard materials. Suitable for use in all materials, including wood, masonry, tiles, aluminium, cast iron, steel, corian and hard and soft plastics. Set contains 5.5, 6, 7 x 100mm, 8 x 120mm Bits