Ateco Tube Tip # 2A/ 805 Extra Round is a large, round tip with an opening diameter of approximately 0.375 inches (3/8 inch) for the Wilton brand and 0.95 cm (9.5mm) or 0.87 inches (7/8 inch) for other brands like Ateco or PME. 

This size is ideal for significant decorative elements such as thick outlines, big dots, swirls, and filling macarons or cannolis.