Drill bit set Makita D-78346 HSS-GS 6-piece for metal

Makita D-78346 HSS-GS 6-piece drill bit set is designed for drilling clean holes in metal workpieces. The set contains high-speed steel ground and polished bits suitable for both hand-held and machine drills. Intended for maintenance, fabrication, and workshop tasks, the bits provide consistent cutting performance and resistance to wear under normal drilling conditions.

Advantages

The HSS-GS construction delivers improved hardness and cutting-edge retention compared with plain high-speed steel, while the ground and polished finish reduces friction and facilitates chip evacuation. The set covers a range of commonly used diameters to accommodate routine metalworking tasks. These drill bits are compatible with standard chucks and are balanced for steady rotation in machine and hand drills.

Suitable for

• Drilling through mild steel, sheet metal, and non-ferrous metals
• Maintenance and repair work in workshops and industrial settings
• Fabrication and assembly of metal components
• General-purpose drilling with hand-held and drill-press tools

Key specifications

• Material: high-speed steel, ground and polished
• Number of pieces: 6 bits covering common diameters for metal drilling
• Tip geometry: ground point for effective center starting and chip formation
• Finish: polished surface to reduce friction and improve chip flow
• Compatibility: suitable for use in hand drills and drill presses with standard chucks

How to use

Select a drill bit with the appropriate diameter for the hole required and secure it in the drill chuck. When drilling metal, mark the drilling position and consider creating a small center punch dimple to prevent walking. Start drilling at a low speed to establish the hole, apply steady feed pressure, and increase speed as the bit penetrates. Use cutting fluid or lubricant to reduce heat and prolong bit life, and clear chips periodically to maintain cutting performance. After drilling, remove burrs and inspect the hole for dimensional accuracy.

Usage recommendations

Use a suitable cutting lubricant when drilling ferrous metals, maintain moderate feed pressure to avoid overheating, and store the bits in a dry place to prevent corrosion. Replace bits that show significant wear or chipping to maintain hole quality and tool safety.