Concrete spiral drill Makita E-24898, 20 mm diameter, 450 mm length

Spiral concrete drill Makita E-24898, 20 mm diameter and 450 mm overall length, is a long-reach bit developed for drilling straight holes in concrete and masonry. The spiral shank design removes dust efficiently while maintaining bit stability during rotary or hammer drilling with tools that accept spiral shank bits. It is intended for creating deep anchor holes, through-holes and installations that require consistent diameter and alignment over extended depths.

Advantages

The spiral flute geometry ensures continuous chip evacuation, reducing packing and improving drilling speed in dense materials. Hardened carbide tip and a reinforced shank provide wear resistance and extend service life when used with appropriate drilling equipment. The extended length allows reaching deeper fixings without the need for extensions or repeated repositioning, and the 20 mm diameter gives a balance between hole size and structural integrity for anchors and through-fixings.

Suitable for

• Drilling deep anchor holes in reinforced and non-reinforced concrete
• Through-holes for plumbing, electrical, or fastening installations
• Work with rotary or hammer drills compatible with spiral shank bits
• Professional construction and renovation tasks as well as advanced DIY projects

Key specifications

• Diameter: 20 mm
• Overall length: 450 mm
• Shank type: spiral shank for secure engagement in compatible chucks
• Tip material: carbide cutting tip for masonry and concrete
• Flute design: spiral flute for efficient dust and debris removal

How to use

Select a rotary or hammer drilling tool that supports spiral shank bits and secure the drill firmly in the tool’s holder. Mark the drilling position and ensure adequate support and alignment before starting. Start drilling at low speed to establish the initial guide, then apply steady pressure and increase speed according to the host material and tool recommendations. Periodically withdraw the bit during long holes to clear accumulated dust and check progress. Use appropriate personal protective equipment such as safety glasses, hearing protection and a dust mask when drilling concrete or masonry.

Recommendations

For best performance and longevity, use this 20 mm × 450 mm spiral concrete drill with compatible tools rated for masonry work, avoid excessive lateral force, and keep the bit clean of packed dust by withdrawing at intervals. Match drilling speed and feed pressure to material hardness and follow tool manufacturer guidance for hammer or rotary drilling modes.