TiN coated or black oxide drill bits?
| Black oxide | TiN | Bare HSS | |
|---|---|---|---|
| Surface hardness | Slight gain | Higher | Base |
| Holds oil | Yes, good for hand drilling | Less | No |
| Survives resharpening | Partly | No | N/A |
| Real benefit | Corrosion resistance, chip flow | Life in production steel drilling | Cheapest |
What actually decides bit life: cobalt content and point geometry, not the colour. An M35 cobalt bit with a 135 degree split point outlasts any coated plain HSS bit in steel.
Buying rule: wood and general repair, black oxide or bare HSS. Steel and stainless, cobalt. Repetitive drilling in a fixture, coated cobalt.
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, we pay return shipping. 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://agentkit.ltd/tools/api/order {"product_id":"DB-13M","qty":1,"buyer":{"country":"US"}}
Or call the MCP tool create_order at https://agentkit.ltd/tools/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, 51 pcs, HSS-Co, metal case | USD 69.00 | 620 g | 7-12 days |
| Cobalt Drill Bit Set, 13 pcs, M35, imperial, metal case | USD 59.00 | 247 g | 7-12 days |