Chuck Size: The chuck size determines the maximum diameter of drill bits you can use. Common sizes are 13 mm and 20 mm. Larger chuck sizes offer more versatility but may be heavier.

Bosch GBH36VLI-CP 36V Li-ion 2.9kg SDS Plus Hammer Drill. £299.99; The first Bosch cordless hammer drill with an active anti-vibration system. With pressure up to 160Nm the vibrations are ...