Olympia Tools 13pc M35 Cobalt Drill Bit Set 1.5mm-6.5mm

13-piece M35 cobalt drill bit set

This 13-piece set covers metric sizes from 1.5 mm to 6.5 mm including 2 mm, 2.5 mm, 3 mm, 3.2 mm, 3.5 mm, 4 mm, 4.5 mm, 4.8 mm, 5 mm, 5.5 mm, 6 mm and 6.5 mm. The M35 cobalt alloy resists heat and wear when drilling stainless steel, cast iron, copper, aluminium and other soft metals as well as plastics and wood. A 135-degree split point helps the bit self-centre and start quickly without walking. The bits come in a plastic index case for organised storage.

Check shank fit and material limits

Verify that your drill chuck accepts straight shanks up to the largest 6.5 mm bit in the set. The manufacturer notes the bits are not suitable for quenched or hardened bolts, so avoid using them on those fasteners. Confirm the workpiece material matches the listed metals, plastics and wood to get the expected cutting performance.

Heat resistance and cutting behaviour

Cobalt alloy construction allows the bits to run hotter than standard high-speed steel without losing hardness, reducing the need for frequent cooling pauses. The 135-degree split point and twist geometry promote faster chip evacuation, which helps keep temperatures lower during continuous drilling. Normal hand-pressure drilling produces typical rotary-tool noise levels; no forced-air or liquid cooling is required for the materials listed.