1/2 Inch Cobalt Drill Bits 5pc Set - M35 HSS Jobber Length

In this review the 1/2 inch cobalt drill bits 5pc set is evaluated as a practical choice for hobbyists and tradespeople who need reliable performance on hard metals. The bottom line: the M35 cobalt composition and 135 degree tip deliver sharp, consistent drilling through stainless steel, cast iron and softer materials, while the included sturdy plastic case keeps the set organized for jobsite use. This set stands out for everyday metalwork and general shop tasks where long-wearing HSS performance matters.

Key Features

• M35 Cobalt construction: delivers improved heat resistance and wear life for drilling into stainless steel and hardened materials without rapid dulling.
• 135 degree tip: provides self-centering action to reduce walk-off and improve accuracy when starting holes on metal and plastic surfaces.
• Jobber length with 4-1/2 in flute: balances reach and rigidity for general purpose drilling while helping chip evacuation during longer cuts.
• Hardened and polished flutes: improve cutting sharpness and reduce wobble for cleaner holes and smoother drilling feel.
• Sturdy plastic case: protects the five drill bits and makes storage and transport simpler for mobile or workshop use.
• Versatile material use: effective on stainless steel, iron castings, copper, aluminum, wood and plastics for a range of projects.

Who It's For

The set is best for DIYers, metal fabricators, mechanics and workshop users who need a handful of robust 1/2 in drill bits that hold an edge on stainless and other hard metals. It is also suitable for contractors who appreciate a compact case and reliable HSS performance for routine drilling tasks.

Those who need an extensive assortment of sizes or purpose-specific coatings (for example carbide or titanium nitride for extreme wear resistance) should look elsewhere; this product is a focused 1/2 in M35 HSS offering rather than a full mixed-size kit.

Pros & Cons

Pros

• Durable M35 cobalt alloy gives better heat resistance and cutting life on hard metals.
• 135 degree tip and polished flutes make starts more accurate and chips evacuate more easily.
• Solid, job-ready packaging with a sturdy plastic case for storage and transport.

Cons

• Durability received mixed customer feedback, with one report of smaller bits breaking under heavy use, so extreme applications may require care.

Specifications

Packaging	5 pcs in plastic case
Diameter	1/2 in
Flute Length	4-1/2 in
Material	M35 cobalt high speed steel (HSS)
Tip Angle	135 degree
Intended Materials	Stainless steel, cast iron, copper, aluminum, wood, plastic

Our Verdict

The 1/2 in M35 cobalt drill bit set is a solid, value-focused choice for users who regularly drill metal and want a durable HSS option with good heat resistance and accurate starts. It offers sensible packaging and dependable performance for most shop and jobsite tasks, though those doing extreme heavy-duty production drilling should consider purpose-built alternatives.

Frequently Asked Questions

Can these bits be used on stainless steel?
Yes, the M35 cobalt composition and hardened cutting edges are intended to handle stainless steel and other hard metals.

What length are the flutes?
The flute length is 4-1/2 in, giving a jobber length reach suitable for general drilling tasks.

Is there a warranty or return policy?
The seller offers a 100% refund or replacement if you are not satisfied with the product.