No, my door is 1.5cm thick and it just fits.

The "hook" is designed for a maximum thickness of 2 cm. The door can of course be thicker, as long as the stop lip is not thicker than 2 cm.

The two upper brackets for hanging the door hanging rail on the door have an internal dimension of 20 mm.

Hello, door without door rebate with 4 cm this unfortunately does not fit

I have this model with the 6 hooks, which has a width of 51 cm. The width of the suspension is 2 cm and this fitted my door without any problems. The door is a good 7 cm thick in total, but it consists of 3 parts and the suspension is only via the innermost (i.e. the 3rd part of the door layers) - and this is only 1.5 or max. 2 cm wide. This means, however, that the specification here at Galaxus of 5.5 cm or 8 cm width is incorrect. You can see that the shorter model has only 4 hooks, the wider one 6. Hope this helps.

No, only the two suspension hooks are coated.