Expert CYL-9 Multi Construction Drill Bit - up to 5x more precise than a standard drill bit The Bosch 2608900604 has a 4mm diameter, working length of 40mm and an overall length of 75mm with a straight shank. This drill bit is ideal for drilling practically all materials including concrete, brick, wood, plastic and more. The modern construction site requires working on many different materials, and you never know what you will need to drill next. Finding the right drill bit can be difficult and time-consuming - unless you have the EXPERT MultiConstruction Drill Bit. The Bosch EXPERT CYL-9 MultiConstruction Cylindrical Drill Bit is the one drill bit that should always be in your toolbox: you\'ll never get stuck on a job or waste time looking for the right bit. Features: Accurate drilling is easy with patented Bosch Centering Geometry Start holes accurately with a specially-designed centering tip Up to 5x more precise than a standard drill bit High-performance carbide tip manufactured by fine grinding Optimised dust extraction channel for fast, efficient drilling Specification: Diameter: 4mm Working length: 40mm Total length: 75mm Shank: Straight