Drill bit Bosch Expert CYL-9 MultiConstruction 10 mm x 250 mm

Bosch Expert CYL-9 MultiConstruction 10 mm x 250 mm is a long-reach drill bit designed for drilling precise 10 mm holes in a variety of construction materials. The 250 mm overall length gives extended working reach for installations that require deeper penetration, while the 10 mm working diameter fits common fixings and anchors used in construction, plumbing and electrical work. The bit is compatible with rotary and hammer drilling modes and is intended for use with standard 1/4" hex shank or round-shank adaptors depending on the drill chuck type.

Advantages

The CYL-9 MultiConstruction bit combines a long flute for efficient dust removal with a carbide tip engineered to withstand impact and abrasion in mixed-material tasks. Its length reduces the need for extensions or step drilling when creating deep anchor points, and the construction of the tip and flute geometry helps maintain straightness and hole accuracy over extended depths. The bit is suitable for repeated use in installation tasks where consistent 10 mm holes are required.

Suitable for

• Drilling 10 mm holes in concrete, masonry and brick
• Creating anchor and fixing points for installations
• Through-drilling for plumbing and electrical conduits
• Deep-hole drilling where standard-length bits are insufficient

Key specifications

• Diameter: 10 mm
• Total length: 250 mm
• Drilling depth (working flute length): suitable for extended reach deep holes
• Tip material: carbide tip optimized for mixed construction materials
• Shank type: compatible with common drill chucks and adaptors (check drill compatibility)
• Suitable drilling modes: rotary and percussion/hammer

How to use

Mark the drilling position and secure the work area. Select suitable drill speed and, if drilling into masonry or concrete, use percussion mode. Start drilling at low speed to establish the cut, then increase speed and apply steady pressure without forcing the bit. Periodically withdraw the bit to clear debris and improve dust removal through the flute. For deep holes, maintain alignment and avoid lateral forces that could bend or chip the tip. Use appropriate personal protective equipment, including eye and hearing protection.

Usage recommendations

For best performance when drilling concrete or reinforced masonry, use a hammer drill with stable chucking and allow the carbide tip to do the cutting. Keep the bit straight during drilling to preserve tip integrity and extend service life. For repeated deep drilling, consider intermittent withdrawal to clear dust and avoid overheating. Match drill speed and percussion settings to the material hardness to achieve consistent 10 mm holes.