Cobalt Drill Bit Set 115Pcs M35 High Speed Steel Bits - Durable

In this review the Cobalt Drill Bit Set 115Pcs is judged primarily as a versatile drill kit for hobbyists and tradespeople who need a wide range of sizes and the ability to cut harder materials. The biggest reason to consider this set is the inclusion of M35 cobalt bits in 115 sizes, which provide greater hardness and heat resistance than ordinary HSS for tasks on stainless steel, cast iron and other tough metals while remaining useful for wood and plastics.

Key Features

• Comprehensive size range: The set includes 29 fractional sizes, 26 letter sizes and 60 numbered sizes so users rarely need an additional bit when working on varied projects.
• M35 cobalt construction: The M35 alloy offers improved hardness and heat resistance for drilling through stainless steel, iron castings and other hardened metals without rapid wear.
• 135 degree point tip: The split-point geometry is self-centering to reduce walk-off and speeds initial penetration for cleaner, more accurate holes.
• Jobber length design: Standard jobber length provides a good balance of reach and rigidity for general purpose drilling in both metal and non-metal materials.
• Indexed metal storage case: The compact metal index storage box keeps bits organized by size for faster selection and safer transport between jobsites.

Who It's For

The Cobalt Drill Bit Set is best for mechanics, metal fabricators, and DIYers who face a mix of materials and need durability when drilling hardened or stainless steels. Its large variety of sizes is especially useful for workshop environments where both fractional, letter and numbered sizes are required.

People who only drill occasional wood or plastics and never cut hardened metals may find this set excessive in cost and selection; a smaller HSS or titanium-coated set could be more economical for light home tasks.

Pros & Cons

Pros

• Wide 115-piece assortment covers fractional, letter and numbered sizes for most hole patterns.
• M35 cobalt composition holds up better under heat and abrasion compared with standard HSS.
• 135 degree point and twist design improve centering and chip evacuation for faster, cleaner drilling.
• Sturdy metal index storage box simplifies bit selection and storage.

Cons

• Some users report variable sharpness between bits, so a quick touch-up may be needed for certain sizes.
• For strictly light-duty woodworking or occasional household jobs the full set may be more than required.

Specifications

Our Verdict

The Cobalt Drill Bit Set 115Pcs is a practical choice for anyone who needs a broad selection of durable bits that can handle stainless steel and other hardened metals while still working on wood and plastics. Given the M35 cobalt construction, 135 degree point and organized metal case, it represents good value for workshops and prosumers who value range and durability over minimal cost.

Frequently Asked Questions

Can these bits drill stainless steel?
Yes, the M35 cobalt composition and 135 degree tip are designed to cut stainless steel and other hardened metals.

Are the sizes clearly marked for quick selection?
Yes, the set includes indexed holders in a metal storage case that list fractional, letter and numbered sizes for easy sorting.

Will these bits work for woodworking?
They will work for wood and plastics, but the set is optimized for metalwork and may be more than needed for light woodworking tasks.