Those small holders are useful in this very hot summer for 6mm hose fixing for plant watering as shown on the photos.
I use it together with my watering head and hose couplers.
https://www.printables.com/cs/model/272427-zavlazovaci-hlavice-watering-head
https://www.printables.com/cs/model/511193-hose-couplers-for-watering
The author marked this model as their own original creation.