Donau Elektronik HSS-CO-200 HSS Cobalt Twist Drill Bit Set, 10 Pieces, 0.3–1.2 mm, DIN 338, Cylindrical Shank

Precision drilling in tough materials demands a bit that stays sharp and true, and the Donau Elektronik HSS-CO-200 set delivers exactly that with its cobalt-alloyed high-speed steel. Unlike standard HSS bits that dull quickly in hard metals, these cobalt-enriched twist drills maintain their cutting edge longer, making them a reliable choice for demanding workshop tasks. The set includes ten diameters from 0.3 mm to 1.2 mm in 0.1 mm steps, covering the fine range often needed for electronics, model making, and precision metalwork.

Highlights

• Set of 10 twist drill bits with diameters from 0.3 to 1.2 mm in 0.1 mm increments
• Made from HSS-Co (cobalt-alloyed high-speed steel) for enhanced hardness and heat resistance
• DIN 338 standard with cylindrical shank and right-hand cutting direction
• Bright surface finish and h8 tolerance for consistent, accurate holes
• Suitable for metal, steel, cast iron, non-ferrous metals, and plastics

In daily use

These bits are engineered for precision and longevity. The cobalt alloy allows them to withstand higher temperatures without losing hardness, so you can drill through tough steel or cast iron without frequent resharpening. The standard spiral flute design efficiently clears chips, reducing binding and improving hole quality. The right-hand cutting direction is compatible with most drill presses and hand drills, and the cylindrical shank fits standard chucks. The fine diameter range is particularly useful for pilot holes, small fasteners, and intricate work where accuracy is critical.

Full specifications

• Product type: Drill bit set
• Drill bit type: Twist drill bit
• Material: HSS-Co (high-speed steel with cobalt)
• Standard: DIN 338
• Shank type: Cylindrical shank
• Number of pieces: 10
• Diameter range: 0.3 mm to 1.2 mm
• Included diameters: 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2 mm
• Cutting direction: Right-hand cutting
• Surface finish: Bright
• Tolerance: h8
• Flute type: Standard spiral flute
• Recommended applications: Metal, steel, cast iron, non-ferrous metals, plastics

Final note

For professionals and hobbyists who need fine, accurate holes in hard materials, the HSS-CO-200 set offers the durability and precision of cobalt steel in a convenient range of small diameters.