That metal chuck looks nice.
thats why they are including them in the pack, becsuse nobody would buy them
https://www.its.co.uk/pd/GSBGDRVLI-Bosch-18v-Robust-Series-Twin-Pack-_BOSRSGSBGDR18LI.htm £239 with impact driver. GSB18VE-2-LI Robust Series cordless hammer drill/driver and GDR18VN cordless impact driver. 2 x 4.0Ah Li-ion Batteries
I'll let you know how badly it eats through the 3ah when I get it. I'm upgrading from a burnt out 2ah Makita so I think I'll still see a positive difference (embarrassed)