What people love (and don’t love)
What people love
- Strong and good quality, especially for small diameter bits.
- Effective at drilling through hardened metals like stainless steel and cast iron.
- Long-lasting; some users drilled hundreds of holes without sharpening.
- Works well for detailed projects like model making and 3D printed parts.
- Affordable price with good overall performance.
What people don’t love
- Some users found the bits fragile, breaking quickly during use.
- Bits are very small, requiring careful measurement and appropriate tools.
- Can wear out or burn up quickly when used on very tough materials.
Reliable and strong cobalt drill bits with good durability, though care is needed due to small size and occasional fragility.
Summary based on customer review evidence.
Quick facts
- Brand: FiLwW
- Price: USD 26.99
- Rating: 4.40 (81 reviews)
If you regularly drill stainless steel, cast iron, or other harder metals, a cobalt HSS bit set can be a smart upgrade over standard bits. This FiLwW 10-piece kit includes ten matching 3/8″ jobber-length bits made from M35 high-speed steel with cobalt, designed to hold up under higher-heat drilling and continue cutting efficiently.
You can view the current price and full details on Amazon here.
The set uses a straight shank and spiral flutes, making it a practical choice for general shop work, repairs, and maintenance—especially when you want consistent results from bit to bit. It’s also suitable for non-metal materials like wood and plastic when your project calls for a 3/8″ hole.
- 10-piece set of 3/8″ (0.38″) jobber-length drill bits
- M35 high-speed steel with cobalt construction for wear resistance and thermal stability
- Spiral flute, 2-flute design for drilling performance
- Straight shank for broad drill compatibility
- Surface recommendations include metal, stainless steel, plastic, and wood
What you get: 10 total pieces in one set (FiLwW). If you have questions during use, the brand notes support is available and aims to respond within 24 hours.
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