What do you expect from a bottle holder? He holds bottles! But does not make it. Have 2 bottles lost in a race, both made of plastic, so do not even aluminum bottles. Both plastic bottles had the round depression for holding. If it is a little faster, flies off the bottle. Never had I at a Alubügelhalter previously. The bottle holder has found its way into the junk box, response to the dung was buying a CamelBak.
I can not recommend him. Add to that the poor workmanship of the edges. Either self deburring or look elsewhere. The price of 5 lets it get over something that you bought scrap ...