Drill Bit Set Makita D-78352 HSS-GS, 19-piece high-speed steel twist bits

Makita D-78352 is a 19-piece drill bit set manufactured from HSS-GS high-speed steel, designed for general-purpose drilling in metals and other materials suitable for HSS bits. The set covers a useful range of diameters to handle varied hole sizes and is supplied in a compact storage case for secure transport and organized storage. The twist-drill geometry and HSS alloy deliver wear resistance and cutting stability for routine workshop, maintenance and construction tasks.

Advantages

The HSS-GS material provides a balance of hardness and toughness for consistent cutting performance and resistance to heat build-up during standard drilling operations. Precision-ground flutes and point geometry improve chip evacuation and reduce walking at drill start, while the included storage case protects the bits and keeps them sorted by size. The set’s range of diameters minimizes the need to source individual bits for common metalworking holes.

Suitable for

• Drilling holes in ferrous and non-ferrous metal sheets and plates
• Workshop maintenance and repair tasks requiring metal drilling
• General construction and fabrication where HSS bits are appropriate
• Portable toolkits for service technicians and tradespeople

Key specifications

• Number of pieces: 19
• Material: HSS-GS (high-speed steel)
• Drill type: Twist drill
• Application: Metal and other materials suitable for HSS bits
• Storage: Compact protective case for organization and transport
• Finish: Precision-ground flutes and standard point geometry

How to use

Select the drill bit diameter appropriate for the required hole size and secure it in the drill chuck with proper tightening. Use appropriate drill speed and feed for the material being drilled—lower speeds for larger diameters and harder metals to reduce heat and preserve bit life. Apply steady, even pressure and allow the tool to do the cutting; withdraw periodically to clear chips and cool the cutting edge. Use cutting fluid where recommended for metal to improve lubrication and reduce wear.

Recommendations

Store the bits in their case to prevent damage and maintain size organization. Match drill speed and lubrication to material hardness and hole diameter, and replace excessively worn or chipped bits to maintain hole quality and operator safety.