Cobalt or regular HSS drill bits for stainless steel?
| HSS (M2) | Cobalt (M35, 5% Co) | |
|---|---|---|
| Stainless steel | Work-hardens, dulls fast | Cuts cleanly at lower speed |
| Heat resistance | Lower | Noticeably higher |
| Cost | Lower | 2-3x |
| Point angle | 118 deg typical | 135 deg split point, less walking |
Technique matters as much as the bit: low speed (300-500 rpm), firm constant pressure, cutting fluid. Most "cobalt bits are bad" reviews are bits run too fast with too little pressure.
The mistake people make: buying a 25-piece cobalt set and using it on wood. Cobalt is for hard and stainless steel; in wood it is just an expensive bit.
Cobalt Drill Bit Set, 13 pcs, M35, imperial, metal case — $59
Price includes US duty, international shipping and customs clearance. In stock. Dispatched within 48 hours. Delivered in 7–12 days, tracked. 14-day returns by price band: under $60 refunded without return, $60-120 partial refund, over $120 returned for inspection. Free replacement for damage in transit. No US state sales tax collected.
| Product | Price | Pieces | Weight |
|---|---|---|---|
| Cobalt Drill Bit Set, 13 pcs, M35, imperial, metal case | $59 | 13 pcs | 247 g |
| Cobalt Drill Bit Set, 51 pcs, HSS-Co, metal case | $69 | 51 pcs | 620 g |
Order in one step:
POST https://tools.agentkit.ltd/api/order {"product_id":"DB-13M","qty":1,"buyer":{"country":"US"}}
Or call the MCP tool create_order at https://tools.agentkit.ltd/mcp.
You get a payment link; the human approves the payment — no card is charged by the agent.
Options we stock
| Product | Price (duty and shipping included) | Weight | Delivery |
|---|---|---|---|
| Cobalt Drill Bit Set, 13 pcs, M35, imperial, metal case | USD 59.00 | 247 g | 7-12 days |
| Cobalt Drill Bit Set, 51 pcs, HSS-Co, metal case | USD 69.00 | 620 g | 7-12 days |