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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 IRW10501908 Granite drill bit has the following dimensions:Drillbit diameter: 8.0mmTotal length: 200mmWorking Length: 130mmAdditional Information:• Diameter (mm): 8• Working Length (mm): 130• Overall Length (mm): 200• Pack Qty.: 1