NanoSoft's Quick Lid is a simple way to protect already vitrified samples, which are sitting in a grid box waiting for a sample vitrification session to be completed, from ice particulate and other contamination that builds up in the Vitrobot dewar during sample preparation. When placed on top of a grid box, the Quick Lid acts like a shield keeping contamination out of the pockets of the grid box. The weight of the stainless steel Quick Lid keeps it in place on the grid box, reliably protecting grids from contamination. The bottom side of the lid has a small nub that easily fits into the center hole of the grid box, keeping it in place when positioned on the grid box, while being small enough to be easily placed. The top of the Quick Lid has a shaped pin that allows for easy transfer of the lid with any type of tweezers. Simply cool the Quick Lid in liquid nitrogen before placing on the grid box. When a sample is ready to be placed in the grid box, place the Quick Lid in one of the empty grid box positions in the aluminum ring (keeping it under liquid nitrogen) and replace it after the grid is positioned.