Drill bit set Makita D-78368 HSS-GS, 25-piece, high-speed steel

Makita D-78368 HSS-GS 25-piece drill bit set provides a range of high-speed steel drill bits intended for metalworking and general-purpose drilling tasks. The set includes commonly used diameters in an organized case and is compatible with standard drill chucks. Designed to deliver reliable cutting performance, these HSS-GS bits are suitable for routine workshop, installation and repair jobs where clean, repeatable holes in metal and other materials are required.

Advantages

The high-speed steel (HSS-GS) composition ensures good heat resistance and wear characteristics during continuous drilling in metallic materials. The set format offers a selection of sizes that cover typical workshop needs, minimizing the need to change tools frequently. Bits are ground to standard geometry for efficient chip removal and stable centring in common drilling conditions. The included storage case keeps bits organised for transport and quick access on-site.

Suitable for

• Drilling mild steel, aluminium and non-ferrous metals
• General-purpose workshop drilling
• Maintenance, repair and installation tasks
• Prototype fabrication and light metalworking

Key specifications

• Material: High-speed steel (HSS-GS)
• Set size: 25 pieces covering a range of commonly used diameters
• Shank type: Straight round shank for standard drill chucks
• Tip geometry: Standard twist-drill point for general-purpose drilling
• Storage: Compact case for organisation and portability

How to use

Select the drill bit size appropriate for the required hole diameter and material. Secure the bit in a standard drill chuck and clamp the workpiece where possible to prevent movement. Use cutting lubricant when drilling tougher metals to reduce heat and prolong bit life. Start at a moderate speed to establish the hole, then adjust drill speed according to material hardness and bit size. Clear chips regularly and avoid excessive feed force to minimise risk of breakage.

Recommendations

For longer bit life when drilling steel, apply light cutting oil and maintain moderate speeds. For aluminium and softer non-ferrous metals, use higher speeds with chip clearing to avoid clogging. Replace worn or damaged bits to maintain hole quality and reduce the risk of workpiece damage.