Peeso reamers are specialized tools used in endodontic and restorative procedures to enlarge and shape root canals, particularly for post preparation. With their long, parallel-sided design and blunt cutting tips, they efficiently remove gutta-percha and dentin while maintaining control over the canal’s shape. Unlike standard files and reamers, Peeso reamers are primarily used in straight canals to create space for posts or to refine access openings. Their efficient cutting ability allows for smooth preparation without excessive removal of tooth structure, preserving strength while ensuring a proper fit for restorations. Peeso reamers help streamline post and core procedures while reducing the risk of canal perforation. Their role in shaping and refining canals makes them an essential tool in restorative and endodontic workflows.