Impact resistant, heavy-duty CYL-5 drill bit set have long life for drilling in hard materials such as concrete and granite, with a fast drilling speed these drill bits are hard to wear out. The new Vario flute reduces friction and aids fast dust removal quickly. The diamond ground tungsten carbide tip helps to reduce break-out. The new power grip system makes for a stronger more positive grip in the drill chuck. Suitable for granite, concrete, brick, natural and artificial stone, masonry and bricks. Supplied as a set of 7 in a strong ROBUSTLine case - sizes 1 x 4mm, 2 x 5mm, 2 x 6mm, 1 x 8mm and 1 x 10mm. Manufactured to ISO 5468.