This is a boat stand for the Supersprint jetboat from M-Jet-Development....
For the boat, simply purchase the Sprint on this page and the Supersprint is included :)
https://www.cgtrader.com/3d-print-models/hobby-diy/other/m-jet-sprint-3d-printable-rc-jetsprint-boat-model
To assemble you need 4x M3x08 screws and 4x press-in nuts M3x5.7x4.6
!!! *You can't load the boat here, just the stand for it :)