Your WARDJet waterjet comes with a choice of four different grating options. So you select the type of grating system that is right for your application (or mix multiple types together). This allows you to get what you need rather than just everyone getting slats, which is what other waterjet manufacturers offer. Slats tend to move in the center. They are wider, causing them to create more kickback into your material. They tend to not be level after the initial usage of the machine.