FiLwW 10-Piece 3/8" M35 Cobalt Drill Bit Set (Jobber Length)

What people love (and don’t love)

What people love

High durability, with some bits lasting over 75 holes in hardened steel without losing sharpness.
Strong performance suitable for various materials including metal, wood, and plastic.
Good quality for the price, offering value and strength in a small diameter bit.
Works well in rotary tools and hand-drilling applications like model making and 3D printed parts.
Sharp and strong, capable of drilling through tough materials without frequent replacement.

What people don’t love

Some users experienced breakage quickly, with bits breaking within seconds of use.
Tiny size may cause confusion or compatibility issues for inexperienced users.
Can burn up faster when drilling through particularly tough bolts or materials.

Effective and durable drill bits offering great value, though some fragility and sizing caution are noted.

Summary based on customer review evidence.

Check price on Amazon

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.