Clarke's top quality, comprehensive drill and screwdriver bit set is ideal for keeping handy & close to your power drill / driver. The full, multi-case set includes titanium coated drill bits (last 10 times longer than standard HSS bits), zirconium nitride coated drill  (they run cooler and last much longer than standard HSS bits), plus all the most commonly used sizes of Pozi, Philips and slotted driver bits.