The "krückstockartige" end (visible on the small image in the upper left corner) is used for attaching to an edge (eg, a door) or for fastening with a screw. If you want to hang the clothes holder in a door, but be warned: the hook-shaped end has a thickness of about 1cm - way too much as that the door would not close! I have the clothes holder screwed firmly to a wall - here there is no problem, on the contrary, the more stable the arc, the better ...
For the lateral stabilization (ie against the "horizontal tilt"), the T-shaped piece of black makes (visible also on the image in the upper left corner or on the image to the door). Unfortunately the bar is "only" plugged and keeps only by the "pressure".
I have the clothes holder firmly installed and to the T-piece connected to a screw with the rod (stick would have been possible). In the tee I have also the left and right end drilled two holes and then fixed the tee with two screws on the wall. So far, I find the clothes holders good services on the wall next to my closet.
In mobile use, keep in mind, in my opinion, that the clothes holder prevents the closing of the door (for the front door to the hotel room he's so in my opinion, inappropriate). When used outdoors should be - especially given the length of comfortable clothes holder - remember the low lateral stability: should even get a gust of wind from the side, I could well imagine that the holder collapsing or even bends. After all, the clothes holder is pulled 100cm long, but the T-piece has a width of only 20cm - resulting possibly a high degree of leverage ...
Unusually friendly I found the communication from the seller, who has even offered in addition to a personal greeting on the delivery support at further inquiry.
In a nutshell: With max. 100cm reach an extraordinary size. Fixed with the aforementioned modifications installed well usable for mobile use have to be taken some caution.