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The Irwin Granite drill bit range has been designed for impact / percussion drilling in very hard materials such as granite, concrete and natural stone. They can drill 40% more holes than conventional masonry drill bits due to an extra hard, thicker and more robust carbide tip. The rounded cutting edges mean higher durability resulting in 50% more accurately sized holes per drill bit.The Irwin IRW10501914 Granite drill bit has the following dimensions:Drillbit diameter: 14.0mmTotal length: 160mmWorking Length: 100mmAdditional Information:• Diameter (mm): 14• Working Length (mm): 100• Overall Length (mm): 160• Pack Qty.: 1