https://actik.tools/product/robert-bosch-power-tools-gmbh-keyless-chucks-up-to-10-mm-for-rotary-drills-drivers/
Robert Bosch Power Tools GmbH Keyless chucks up to 10 mm. For rotary drills/drivers – Actik Tools
robert boschpower toolschucks upgmbhkeyless
https://www.bosch-diy.com/ae/en/p/keyed-chucks-up-to-10-mm-2762858
Keyed chucks up to 10 mm | Bosch DIY
Optimum power transfer due to secure hold of the drill bit
chucks upkeyedboschdiy