The Mitegen Cryo-EM Dewar Insert is essential for securely holding Cryo-EM pucks such as the MiTeGen Generation 2 cryoem puck SKU M-CEMG2-1 and facilitating seamless grid box transfers while immersed in liquid nitrogen (LN2). This accessory is vital for cryo-electron microscopy workflows, ensuring stable positioning of Cryo-EM Pucks. It simplifies transferring Cryo Grid Boxes to or from pucks and allows researchers to reliably locate indexed positions of Cryo Grid Boxes, streamlining sample management and minimizing handling risks. Designed for optimal performance in cryogenic environments, this dewar insert helps maintain sample integrity and improve efficiency during critical Cryo-EM sample preparation and storage. It is an indispensable tool for labs prioritizing precision and safety in their cryo-EM operations, ensuring valuable samples remain secure throughout the transfer process.