41/64 in Cobalt Drill Bits 3 Pack - Precision Metal Drilling

In this review of the 41/64 in Cobalt Drill Bits 3 Pack the bottom line is simple: these are purpose-built bits for people who frequently drill hard metals and need a consistent, precision diameter. The set includes three M35 cobalt bits with a 41/64 in diameter, a 3 in flute length and 6 in overall length, and the reviewer found the most compelling reason to buy is the combination of a fully ground diameter and a 135 split point that reduces walking and improves repeatable hole placement in tough materials.

Key Features

• 41/64 in Diameter: Delivers a consistent hole size useful for tasks that require a precise 41/64 in finished hole.
• M35 Cobalt Construction: Contains 5% cobalt for increased heat resistance and wear life when drilling hardened and stainless steels.
• 3 in Flute and 6 in Overall Length: The flute depth supports through-drilling and chip evacuation while the 6 in overall length reaches deeper workpieces.
• Fully Ground, 135 Split Point: Fully ground geometry and the split point start cleaner and reduce the need for pilot holes on metal.
• Plastic Storage Case: A tough plastic case keeps all three bits organized and protected between jobs.

Who It's For

These bits are aimed at professional fabricators, maintenance techs and serious DIYers who work with metal regularly - stainless steel, hardened steel, cast iron, bronze and other tough alloys. The M35 grade and split point are especially useful when repeated holes and accuracy are important.

Those who only drill soft materials or need a wide assortment of sizes should look elsewhere; this pack is a specialized set centered on a single 41/64 in diameter rather than a general multipack of varied sizes.

Pros & Cons

Pros

• Precision 41/64 in diameter and fully ground finish give consistent hole sizes for fit-critical work.
• M35 cobalt alloy offers better heat tolerance and cutting life on stainless and hardened steels than standard HSS.
• 135 split point reduces walking and improves starts on hard materials, speeding repeated drilling.
• Included plastic storage case protects the bits and keeps them organized on the job.

Cons

• Pack contains only one diameter so it is not a substitute for a full set of sizes.
• Customer feedback on durability is mixed; some users report breakage under heavy use, so care and correct speeds/feeds are important.

Specifications

Brand	Narwhal
Diameter	41/64 in
Flute Length	3 in
Total Length	6 in
Material	M35 cobalt (5% cobalt)
Point	135 split point, fully ground
Pack	3 pack with plastic storage case

Our Verdict

The Narwhal 41/64 in M35 cobalt 3 pack is a solid choice for anyone who regularly drills hard metals and needs a reliable, precise 41/64 in hole. It offers good value when you consider the M35 alloy, split point starting and protective case; buy it if you need durability and repeatable performance, but expect to use proper feeds and speeds to avoid breakage.

Frequently Asked Questions

Are these drill bits suitable for stainless steel?
Yes, the M35 cobalt composition and split point are intended for stainless and other hardened metals.

How long are the bits?
Each bit has a 3 in flute length and a 6 in total length.

Does the pack include storage?
Yes, the set ships in a durable plastic storage case that holds all three bits securely.