Drill bit Bosch Expert HEX-9 Multi Construction 4 mm — SDS-style hex shank for masonry and multi-material drilling

Bosch Expert HEX-9 Multi Construction 4 mm is a drill bit designed for reliable drilling in masonry and a range of construction materials. The 4 mm diameter and specialized tip geometry provide consistent penetration in brick, concrete, mortar and mixed substrates. A HEX-9 hex shank enables secure seating in compatible chucks and quick changes when used with holders or SDS-style adaptors. The bit is intended for use with hammer drills or impact-compatible drivers where impact action supports efficient material removal.

Advantages

The HEX-9 hex shank offers improved retention and fast bit changes without compromising torque transmission; this reduces slipping during heavy-duty drilling. The cutting geometry and hardened steel construction deliver steady drilling performance and extended wear resistance compared with standard bits. The compact 4 mm size enables precise pilot holes and reduces the risk of material cracking in brittle masonry.

Suitable for

• Drilling pilot holes in brick and concrete for anchors and fasteners
• Creating openings in mortar joints and mixed masonry substrates
• Use with hammer drills, rotary hammers with compatible holders, and impact drivers that accept HEX-9 shanks
• Professional construction and DIY renovation tasks requiring small-diameter masonry holes

Key specifications

• Diameter: 4 mm
• Shank type: HEX-9 hex shank (SDS-style compatibility with appropriate adaptors)
• Intended materials: masonry, brick, concrete, mortar, mixed substrates
• Tip and flute: construction-optimized cutting geometry for masonry drilling
• Recommended drive: hammer drill or impact-capable driver/holder

How to use

Select a drill or holder compatible with HEX-9 hex shanks and secure the bit firmly in the chuck or adaptor. Mark the drilling point and start at low speed to position the tip, then increase speed and apply steady pressure while allowing the hammer action to assist penetration. Clear dust from the hole periodically to maintain cutting efficiency. For deeper holes, withdraw the bit occasionally to remove debris and avoid overheating. Use appropriate personal protective equipment such as safety glasses, gloves and hearing protection.

Recommendations

Use the Bosch Expert HEX-9 Multi Construction 4 mm bit primarily for small-diameter masonry holes; ensure your drill or adapter supports HEX-9 shanks and hammer action for best results. Avoid using excessive lateral force and select correct drill speed for the substrate to extend bit life.