Drill Bit Set Bosch HSS-G 12 mm, 5 pcs, working length 101 mm

Bosch HSS-G 12 mm metal drill bit set includes five high-speed steel bits with a working length of 101 mm, designed for drilling through metal and similar materials. The straight shank and ground flutes provide precise drilling and consistent hole quality. These HSS-G bits are produced to deliver durable cutting performance in workshop, repair and construction applications where straight, reliable metal drilling is required.

Advantages

The HSS-G 12 mm bits offer high hardness and heat resistance typical of high-speed steel, enabling reliable chip evacuation and reduced wear during metal drilling. A consistent geometry ensures accurate centring and straight holes, while the longer working length of 101 mm extends reach for deeper drilling tasks. The set of five identical bits provides replacement options and reduces downtime in repetitive operations.

Suitable for

• Drilling holes in mild and hardened steels and other metals
• Workshop maintenance and general repair tasks
• Construction and installation work requiring metal fastening
• Drilling in sheet metal, metal profiles and structural components
• Use with hand drills, drill presses and portable drilling machines

Key specifications

• Drill type: HSS-G (high-speed steel, ground)
• Diameter: 12 mm
• Working length: 101 mm
• Quantity in set: 5 pieces
• Shank: straight shank suitable for standard chucks
• Flute design: ground flutes for improved chip removal and cutting stability

How to use

Secure the selected 12 mm HSS-G bit into the drill chuck so the shank is firmly tightened. Mark the drilling point and, if necessary, use a centre punch to prevent walking. Start drilling at low speed to establish the hole, then increase speed appropriate to the metal type while applying steady, moderate feed pressure. Use cutting fluid or coolant when drilling thicker or harder metals to reduce heat and prolong bit life. Withdraw the drill occasionally to clear chips and maintain cutting efficiency.

Usage recommendations

Use appropriate personal protective equipment, including safety glasses and gloves. For best results on hardened or high-alloy steels, consider pre-drilling with smaller diameters or using coatings/coolants specifically suited to the material. Store the set in a dry place to prevent corrosion and check bits for wear before use; replace bits that show significant dulling or damage.