<br />The patented, unique single flute design ensures efficient, speedy removal of dust and lower vibrations and 28% greater capacity meaning more efficient waste removal. They have a patented extra-short drill bit head which means the head takes 80% of the workload, ensuring higher durability and speed. Clears drilling dust directly into the flute, reducing the risk of clogging.<br /><br />The bits have 25% more tungsten carbide for extra strength and they drill 25% faster than competitive drill bits with the same high durability. In addition, they have more aggressive cutting angles and self-centring for faster drilling.<br /><br />Irwin Speedhammer Plus Drill Bit.<br /><br />Specifications:<br />Diameter: 5.5mm.<br />Total length: 210mm<br />Working Length: 150mm">