The wilton large tip coupler is ideal for use with large decorating and filling tips the white plastic design is easy to attach and easy to clean and fits with 16 inch and 18 inch piping bag and nozzles this coupler lets you change decorating tips without changing the bag the pack contains one coupler and one ringthis is ideal for prolific bakers allowing you to get the most out of your best decorating tips with ease size 64 x 44 cm 25 x 175 inchesfits 16 inch and 18 inch nozzlesea