What people love (and don’t love)
What people love
- Drills smoothly through metals like stainless steel and mild/hardened steel.
- Good value for a cobalt drill bit set with common sizes included.
- Bits cut well and hold an edge when used properly, especially with a drill press.
- Included bits work well for removing tapped studs and drilling in automotive applications.
What people don’t love
- Some bits arrive dull or break easily; quality consistency is an issue.
- Not effective on hardened tool steel or tempered steel with higher Rockwell ratings.
- Packaging lacks clear cobalt labeling, causing confusion about material authenticity.
- Case quality considered lightweight and less durable by some users.
Effective and affordable for general metal drilling but quality and hardness limitations exist.
Summary based on customer review evidence.
Quick facts
- Brand: WildBossy
- Price: USD 25.99
- Rating: 4.40 (701 reviews)
The WildBossy M35 Cobalt Drill Bit Set is designed for users who drill into harder materials and want a more durable upgrade from standard high-speed steel bits. Made from M35 cobalt steel (Co 5% HSS) and finished with a titanium surface, these jobber-length twist bits are built to cut faster and last longer than typical HSS bits.
You can view the current price and full details on Amazon here.
Each bit features a precise 135° split point to help reduce walking and start holes more accurately. The spiral flute design helps move chips out efficiently, while the 3-flat shank improves grip in the chuck—useful when drilling into stainless steel, steel, and cast iron. The set comes organized in an index-style plastic storage case to keep sizes easy to find.
Included sizes (20 pieces): 1/16×2, 5/64×2, 3/32×2, 7/64×2, 1/8×2, 9/64, 5/32, 11/64, 3/16×2, 7/32, 1/4, 5/16, 3/8, 1/2 inch.
Key features:
- M35 cobalt steel (Co 5% HSS) construction for tougher drilling applications
- 135° split point helps reduce walking and improves starting accuracy
- Titanium surface finish and fully ground twist design for smooth chip movement
- 3-flat shank for improved chuck grip
- Index storage case with 20 pieces covering 1/16″–1/2″ sizes
Recommended uses: stainless steel, cast iron, hardened steel, wood, plastic, and aluminum alloys. Not suitable for glass or ceramic. For best results, control drilling speed, pressure, and heat.
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