This hammer drill uses chucks of the keyless type. Since it runs on a cord, you get more constant power than with a battery.
From Tooled Up
Black and Decker BEH850K Hammer Drill 240v
ShopBetter24
Driver Drill Black & Decker BEH850K 230 V 850 W
Shopaide
Driver Drill Black & Decker BEH850K 230 V 850 W