The Bosch 2608900586 Pack of 5 Expert HEX-9 MultiConstruction Drill Bits in diameters: 5.5 / 6.0 / 6.0 / 7.0 / 8.0mm with 1/4 inch hex shanks. Ideal for drilling practically all materials including concrete, brick, wood, plastic and more. The 1/4" shank provides optimum power output whilst the carbide centering tip ensures a precise start up and good control. 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 HEX-9 MultiConstruction 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.