RICHELIEU 499531 13-piece cobalt drill bit set

13-piece cobalt drill bit set

This RICHELIEU 499531 set contains 13 premium cobalt Tri-Bore drill bits manufactured from M35 steel with 5% cobalt for strength and heat resistance. The third cutting edge on bits 1/8 inch and larger increases cutting surface area for 17% faster cutting while reducing heat and wear. Service life is improved up to three times longer than standard cobalt drill bits.

Compatibility checks before ordering

Verify the material you intend to drill is ferrous or non-ferrous metal such as stainless steel, as these bits are designed for heavy-duty metalwork. Confirm your drill chuck accepts shanks with three flats on sizes 3/16 inch (4.76 mm) and larger for a secure grip. The 135° split-point tip geometry on bits 1/8 inch (3 mm) and larger helps prevent walking on hard surfaces.

Sustained load behaviour

Under continuous drilling the thicker core maintains rigidity and the fully ground manufacturing keeps holes straighter. The third cutting edge reduces heat buildup during prolonged cuts, extending bit life compared to standard designs. M35 steel with 5% cobalt resists softening at elevated temperatures encountered in demanding applications. California Proposition 65 warnings apply for cancer and reproductive harm.