HSS-G Premium COBALT HSS Drill Set – 19 Piece

This 19 piece cobalt HSS drill set covers 1mm to 10mm in 0.5mm steps, giving you the full range for metal work without rummaging through three different cases. Made from M35 high speed steel with 5% cobalt content, these bits handle the jobs that standard HSS drill bits tap out on: stainless steel, high tensile steel, hardened fasteners, cast iron. If you’ve ever watched a cheap HSS bit go blue and dull halfway through a piece of 316 stainless, you’ll appreciate the difference cobalt makes.

The cobalt content isn’t just marketing. It raises the heat tolerance of the steel significantly, which matters when you’re drilling dense materials at sustained speed. Heat is the enemy of a drill bit. The cobalt slows down the point at which the cutting edge softens and fails, meaning the bits stay sharp longer and hold their geometry under load. Combine that with a fully ground finish from solid stock and you get consistently clean, accurate holes with no tearing or burring on exit.

Where This Cobalt HSS Drill Set Earns Its Keep

The 135-degree split point tip is worth flagging separately. Unlike a standard 118-degree tip, the split point self-centres on contact. No wandering, no need to centre-punch first on most surfaces. That alone saves time when you’re running through a batch of holes. The tip also breaks chips more cleanly, which keeps the flutes clear and reduces the chance of the bit binding in deep cuts.

Build Quality and Included Sizes

Every bit in the set is manufactured to DIN338 standard, which defines the geometry, tolerances and material grade. The parallel shank design is compatible with any standard 3-jaw chuck, whether you’re using a hand-held drill driver, a pillar drill or a magnetic drill press. The set ships in a metal case, which actually keeps things organised rather than turning into a rattling drawer of loose bits. All 19 sizes are present: 1.0mm through to 10.0mm in 0.5mm steps. At this price point for a DIN338 cobalt set in a metal case, it’s a straightforward decision.