Cake Decorating Tube Tip 84 - Decorate your cakes, cupcakes, cookies, and pies with this Ateco 84 square pastry tube. Made of durable stainless steel, this tube is rust-resistant and designed to withstand repeated use without bending out of shape. With a square shape, the possibilities with this versatile tip are endless! It is great for producing borders and outlines, as well as dropped-work. It is also compatible with the Ateco 400 coupler and Ateco 407 coupler, making it easy to switch tips without changing the pastry bag. Using the right style pastry tube for the job will enhance your presentation to draw patrons' attention to your display cases and plated desserts. Overall Dimensions: Opening: 0.14" Bottom Diameter: 11/16"