HW is the partner they chose for Angle grinder and Rotary Hammer.
In order to make sure, everything is going undergoing BOSCH standard, they build a unique product line which is allowed produces Bosch brand power tools only.
Together with BOSCH engineers, they build an ERP system to make sure, all bosch angle grinder is made with BOSCH spare parts, and built by BOSCH technology.
And thanks to the data system, BOSCH could spy on the production status any time online.?
Just like iPhone, it is 100% Apple, even though all iPhones are produced by their-party Chinese manufacturers.
Bosch did create a video to advertise their angle grinder, they are high performance even compared with Makita, Dewalt. You can find refer video via youtube