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: 12.0mm Total length: 160mm Working Length: 130mm https://elecena.pl/product/27222918/irwin-10501914-granite-drill-bit-12-0-x-160mm 2024-11-11 https://elecena.pl/product/27222918/irwin-10501914-granite-drill-bit-12-0-x-160mm 2025-03-12 https://elecena.pl/product/27222918/irwin-10501914-granite-drill-bit-12-0-x-160mm 2025-03-23 https://elecena.pl/product/27222918/irwin-10501914-granite-drill-bit-12-0-x-160mm 2026-05-03 https://elecena.pl/product/27222918/irwin-10501914-granite-drill-bit-12-0-x-160mm 2026-07-10