Bosch 2608597656 CYL-3 Silver Percussion Masonry Drill Bit 4 x 40 x 75mm The Bosch 2608597684 is a 4mm diameter drill bit designed for drilling holes in concrete, masonry and brick materials. You can expect high wear resistance thanks to its durable carbide blend and effective 2-flute U-shape design which provides good dust removal, reducing friction and extending the lifetime. Features: CYL-3 Drill Bits provide lasting performance when drilling in concrete High wear resistance from a durable carbide blend developed and manufactured by Bosch Effective 2-flute U-shape design provides good dust removal, reducing friction and extending the lifetime Lasting performance when drilling holes for fixings in abrasive materials such as concrete and natural stones Compatible with cylindrical shank systems for all corded or cordless impact drills Specification: Overall length: 75mm Working length: 40mm Diameter: 4mm