1/2in HSS M35 Cobalt Twist Drill Bits Pack of 5 - Metal Ready

In this review the DelitonGude 1/2in HSS M35 cobalt twist drill bits prove to be a practical choice for professionals and DIYers who need reliable metal-drilling performance without a high price tag. The biggest reason to buy is the M35 high-speed steel with 5% cobalt construction, which consistently delivers faster cutting into hard metals and better wear resistance than standard HSS bits. For users who need solid holemaking in stainless steel, cast iron or other tough materials, these bits offer effective cutting and good value for routine workshop and maintenance work.

Key Features

• M35 high-speed steel with 5% cobalt: Provides improved heat resistance and hardness for cutting into harder metals compared with ordinary HSS bits.
• 1/2in size with 150mm total length: The 110mm work length gives enough reach for deeper holes without sacrificing rigidity.
• 135 degree split point: The tipped geometry helps with self-centering and reduces walking when starting holes on metal surfaces.
• Full-grinding and nitriding: Aims to improve wear resistance and extend tool life under repeated use on hard materials.
• Spiral flute design: Promotes efficient chip evacuation to keep the cut cleaner and reduce clogging during drilling.
• Versatile material compatibility: Rated for steels, stainless steels, cast iron, copper, aluminum alloys, galvanized pipe, wood and plastics for mixed workshop tasks.

Who It's For

These bits are best for professional tradespeople and serious DIY users who regularly drill into metal and want a balance of performance and cost. The cobalt-enriched M35 composition and longer work length make them suitable for fabrication, mechanical repair, plumbing and metal maintenance tasks.

Casual users who only drill occasional holes in soft materials may find them overbuilt and can opt for standard HSS bits instead. Also, operators who demand extreme longevity under constant industrial production should evaluate industrial-grade or carbide solutions for the toughest continuous applications.

Pros & Cons

Pros

• Good material: M35 cobalt steel gives better heat and wear resistance than plain HSS.
• Effective geometry: 135 degree split tip helps start holes cleanly and reduces walking.
• Generous work length: 110mm working length suits deeper holes without extensions.
• Versatile: Works on many materials from stainless steel to aluminum and wood.

Cons

• Mixed reports on durability: some users report bits dulling or breaking under heavy use, so technique and settings matter.
• Not a carbide option: for the absolute hardest continuous production drilling, carbide may last longer.

Specifications

Brand	DelitonGude
Material	M35 high-speed steel with 5% cobalt
Size	1/2in
Total length	150mm
Work length	110mm
Tip angle	135 degree split point
Pack quantity	5 pieces

Our Verdict

For workshop users who need a reliable, mid-priced drill bit that handles hard metals, the DelitonGude 1/2in M35 cobalt bits are a solid value. They combine durable material, a self-centering tip and ample work length to tackle most repair and fabrication tasks, though users performing heavy continuous drilling should consider harder-wearing carbide options for peak longevity.

Frequently Asked Questions

Can these drill stainless steel?
Yes, the M35 cobalt construction and 135 degree tip are designed to cut stainless steel effectively when used with appropriate speeds and cooling.

Will these fit standard drill chucks?
Yes, a 1/2in shank will fit most standard drill chucks that accept 1/2in bits, including handheld and drill press chucks.

Are they suitable for production use?
They are suitable for professional and DIY use, but for high-volume continuous production on the hardest materials, carbide tooling may offer longer life.