Drill Bit Makita D-70328 3 cm Diameter 400 mm Length

The Makita D-70328 drill bit 3 cm diameter 400 mm length is a long-reach, single-piece drilling tool intended for creating deep holes with consistent diameter. Manufactured to match common Makita chuck systems, this 400 mm-long bit combines a 30 mm cutting diameter with a shaft profile designed to maintain straightness and accuracy when penetrating wood, soft masonry, and some composite materials. The geometry of the tip and flute layout helps evacuate chips and reduce binding during continuous drilling tasks.

Advantages

This 3 cm diameter, 400 mm length drill bit provides extended reach for deep-hole applications while preserving rigid performance. The construction supports stable rotation and reduced wobble, enabling precise hole placement. Flute design assists in efficient chip removal, lowering heat build-up and improving drilling speed in compatible materials. The tool's dimensions make it suitable for use with corded and cordless drills that accept its shank diameter and provide sufficient torque.

Suitable for

• Drilling deep through-holes in timber and laminated boards
• Creating mounting or pass-through holes in soft masonry and aerated concrete
• Tasks requiring a consistent 30 mm diameter hole at depths up to 400 mm
• Installation works where long-reach drilling is necessary, such as running cables or pipes through structural elements

Key specifications

• Cutting diameter: 30 mm
• Total length: 400 mm
• Tip and flute design: straight flute for chip evacuation
• Material: hardened steel construction for wear resistance
• Compatibility: for use with drills that accept the specified shank and provide adequate torque

How to use

Secure the drill bit firmly in the drill chuck, ensuring correct alignment and full engagement of the shank. Select an appropriate drill speed and apply steady, moderate pressure; avoid excessive force that can cause bit deflection. For wood and composite materials, start at a lower speed to establish a clean entry, then increase speed as chips evacuate. When drilling masonry, use a rotary hammer or drill with suitable mode if required by material hardness and select a lower speed to reduce bit wear. Periodically withdraw the bit to clear chips when drilling deep holes to maintain cutting efficiency and reduce heat.

Usage recommendations

Use protective equipment such as safety glasses and gloves. Match drill speed and torque to the material being drilled, and inspect the bit for damage before use. For prolonged or heavy drilling, allow the bit to cool and consider using lubrication or intermittent drilling to extend tool life.