Bosch 21-Piece Cobalt Drill Bit Set
Usually $100.01
Price checked 50m ago
Stop wasting time on bits that turn dull the second they touch stainless steel.
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Our read on this product
Standard high-speed steel bits often burn out or dull the moment they touch stainless steel or cast iron. These cobalt bits are specifically engineered to handle that heat, meaning you spend less time fighting with a spinning bit that refuses to bite and more time actually finishing the hole.
The three-flat shank on the larger bits is a quiet upgrade that keeps the bit from spinning inside your chuck when you hit a tough spot. They start clean without skating across the surface, which saves your workpiece from those frustrating, accidental scratches.
What makes it stand out
- Three-flat shank design prevents the bit from slipping in the chuck during high-torque drilling.
- Cobalt construction retains its edge through high-heat friction that would soften and ruin standard steel bits.
When this isn't the right fit
- You only need to drill through soft wood or thin plastic, where cheaper high-speed steel bits will do the job just fine.
- You are prone to snapping small bits; cobalt is harder but more brittle than standard steel, so it requires a steady hand.
Real-world notes
- The split-point tip bites into metal immediately without needing a center punch for every hole.
- The laser-etched sizes remain readable even after the bits have been used and covered in oil or metal shavings.
Keep this set in your workshop if you regularly work with stainless steel or other hard metals and are tired of replacing dull bits every few projects.
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