Drill bit Makita D-70378 1.6 cm diameter 600 mm length

The Makita D-70378 1.6 cm diameter, 600 mm length drill bit is a long-reach bit engineered for deeper holes and access into confined or recessed areas. Constructed to deliver consistent cutting performance, this bit is suitable for a range of materials where a long, straight hole is required. The design balances rigidity and length to reduce deflection while maintaining effective chip removal along the flute.

Advantages

This long drill bit offers extended reach for drilling through thick panels, formwork, or multi-layer assemblies. Its diameter and length combination improves drilling accuracy at depth and helps maintain a straight bore. The bit is built for durability and repeatable performance, reducing the need for frequent replacement and supporting both occasional DIY use and regular professional tasks.

Suitable for

• Drilling deep holes in wood and timber structures
• Creating passages through plasterboard and paneling
• Accessing recessed fixing points in furniture assembly
• Electrical and plumbing installations requiring long reach

Key specifications

• Diameter: 1.6 cm
• Overall length: 600 mm
• Shank type: compatible with standard drill chucks
• Material and coating: engineered for wear resistance and chip evacuation
• Intended use: long-reach drilling in construction and maintenance tasks

How to use

Secure the drill bit in a suitable drill chuck ensuring proper centring and tight clamping. Select a drill speed appropriate to the material being drilled and apply steady, controlled pressure to prevent wandering or bending. For long holes, withdraw the bit periodically to clear chips and prevent clogging, and use support or guide templates where precision alignment is required. When drilling into dense or abrasive materials, reduce feed rate and use intermittent pecking motions to manage heat and chip removal.

Usage recommendations

For reliable results, pair this long-reach bit with a drill that provides sufficient torque and speed control; inspect the bit before use for straightness and wear, and follow material-specific drilling techniques to extend service life.