Drill Bit Set, Bosch METALBOR HSS-R 16.5/12 mm, metal drilling set

Bosch METALBOR HSS-R drill bit set for metal includes two high-speed steel bits with diameters 16.5 mm and 12 mm designed to create round, precise holes in a variety of ferrous and non-ferrous metals. Constructed from HSS-R (high-speed steel, rolled) for good cutting performance and resistance to heat during drilling, these bits are intended for workshop, maintenance and fabrication tasks where accuracy and durability are required. The set is compatible with standard bench and hand drills and is suitable for use in professional and hobby environments.

Advantages

The HSS-R material provides consistent cutting performance and heat resistance when drilling metal. Two commonly used diameters in one compact set reduce the need to change tools frequently and simplify job preparation. Precision ground tips ensure round hole quality and reliable centring when used with appropriate pilot points or centre punches. The bits are suitable for repeated use in light to medium-duty metalworking operations.

Suitable for

• Drilling holes in steel sheets and plates
• Creating holes in aluminium and non-ferrous metal components
• Maintenance and repair tasks requiring precise round holes
• Metal fabrication and assembly work
• Use with bench drills and portable hand drills

Key specifications

• Material: HSS-R (high-speed steel, rolled)
• Included diameters: 16.5 mm and 12 mm
• Intended application: drilling through ferrous and non-ferrous metals
• Shank type: straight (suitable for standard chucks)
• Typical use range: light to medium-duty metalworking

How to use

Select the appropriate diameter for the hole required and secure the workpiece to prevent movement. Mark the drilling point and, if necessary, use a centre punch to improve centring. Fit the selected HSS-R drill bit into a drill chuck and tighten securely. Start drilling at a moderate speed, applying steady pressure; reduce speed when breakthrough occurs to avoid burrs. Use cutting fluid or coolant for improved cutting performance and extended bit life when drilling thicker or harder metals. After use, clean and store the bits in a dry location to prevent corrosion.

Usage recommendations

For best results when drilling metal, use appropriate cutting fluid, maintain steady drill speed and allow the bit to cool between heavy cuts. When greater precision is required, pre-drill a pilot hole or use a centre punch; when working with hardened steels consider using specialised coated or carbide-tipped drills.