Jet holder for the Dellorto carburettor used for Rotax Max engines.
It fits 35 jets so it probably holds all your jets that you might have.
It is well designed, milled from one piece of aluminium which is then anodized and laser engraved with the Rotax logo.
On the back are two magnets so you can put it on the lid of the toolbox, or to put it on the kart while changing the jet.
The jest is sensitive so you do not want them lying around loose. This is a must-have in a Rotax toolbox