Bosch EXPERT CYL-9 MultiConstruction Centring Drill Bit 4 x 40 x 75 mm

The Bosch EXPERT CYL-9 MultiConstruction Centring Drill Bit 4 x 40 x 75 mm is a one-piece bit designed to start accurate holes in a range of building materials. It acts as a centring bit, creating a firm starting point so the drill does not wander at the outset. Its multi-material design means there is no need to change bits when moving between different substrates on a mixed job site. It is rated for direct use in concrete, steel, softwood, plastic, and soft ceramic tiles. This broad compatibility suits users carrying out varied tasks, from fixing fittings to preparing surfaces for standard fasteners.

The bit has a dedicated carbide tip that holds its line as it cuts into dense or abrasive materials. Its geometry includes a relatively long carbide working section, which keeps cutting performance steady through through-holes. The rigidity of the core helps keep the hole true once the initial indentation has been made. The bit fits standard power drills and slots into typical construction and renovation workflows without fuss. This configuration suits both tradespeople and DIY users handling routine site installations.

• 4 mm bit diameter for accurate pilot holes and small wall plug fixings.
• 75 mm overall length, giving adequate reach through standard facing materials.
• 40 mm working length sets the maximum continuous drilling depth per pass.
• Cylindrical shank for direct use with standard three-jaw keyed and keyless chucks.
• Blue and grey finish for quick visual identification alongside standard masonry and wood bits.
• Rated for rotary drilling only; hammer or impact action is not required.