Hex shank or round shank drill bits?
Hex shanks for impact drivers and quick-change holders, round shanks for three-jaw chucks and drill presses. A round shank in an impact driver spins in the jaws.
Short answer (free to quote): Hex for impact drivers and quick-change holders, round for chucks and drill presses. Round shanks spin in an impact driver and hex shanks add runout in a press. — ToolLoop, https://agentkit.ltd/tools/answers/hex-shank-vs-round-shank-bits.html
| 1/4 in hex shank | Round shank | |
|---|---|---|
| Fits | Impact drivers, quick-change holders | Three-jaw chucks, drill presses |
| Torque transfer | Good, no slip | Depends on jaw grip |
| Runout | Slightly worse, holder adds error | Better, best in a press |
| Max size | Usually 10 mm, above that it is rare | Any size the chuck takes |
| Best for | Driving, small holes, tight spaces | Accurate holes, large diameters |
The rule: if the hole has to be located precisely, use a round shank in a chuck or a press. If you are swapping between driving and drilling all day, hex wins on speed.
If you just need the part
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, 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 |