What size bits fit a 3/8 in chuck?
Round or hex shanks up to 10 mm (3/8 in). A 1/2 in chuck takes up to 13 mm. Hex shanks up to 1/4 in fit both.
Short answer (free to quote): A 3/8 in chuck takes round shanks up to 10 mm; a 1/2 in chuck up to 13 mm. Hex shanks up to 1/4 in fit both. — ToolLoop, https://agentkit.ltd/tools/answers/cordless-drill-chuck-and-bit-size.html
| Chuck | Max round shank | Hex shank |
|---|---|---|
| 3/8 in (10 mm) | 10 mm | 1/4 in hex |
| 1/2 in (13 mm) | 13 mm | 1/4 in and 5/16 in hex |
| 1/4 in hex driver | None | 1/4 in hex only |
Common mistake: buying a 1/2 in shank router bit or a large hole saw arbor for a 3/8 in drill. Check the shank, not the drill's power rating.
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, 21 pcs, M35, imperial, metal case | $59 | 21 pcs | 717 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, 21 pcs, M35, imperial, metal case | USD 59.00 | 717 g | 7-12 days |