| Brand | Jacobs |
|---|---|
| Drill Chuck Type | Drill Chuck |
| Mounting Size | 1/2 |
| Mount Type | Integral Shank |
| Chuck Type | Keyed |
| Country of Origin | United States |
| California Prop 65 Warning | 604 1589 |
Check the listing for details. Vtg precision drill adapter, 1/2" shank, Jacobs 1B chuck w/ key, exc. condition. Condition: Used, Made in United States. Listed at 50.00 USD. Here's a precision drill adapter with a Jacobs 1B chuck. I don't know if Jacobs made the entire piece. The Jacobs key is also in great shape, and fits the chuck gear precisely.