Using these Metex SPD006 liquid screed levelling tripods is easy. First, adjust the height according to the depth of the material, which can be anywhere from 10mm to 150mm. Place them on the surface where you're working with liquid screed or self - compacting concrete. The elongated stainless - steel nut and M12 threaded shaft make the adjustment smooth. The thick legs provide good stability, so make sure they're firmly on the ground. When it comes to maintenance, keep them dry to prevent rusting, especially since they're made of zinc - plated mild steel. If you notice any loose parts, tighten them up. And remember, they come in packs of 20, so use them as needed for your project.