Ateco Medium Coupler, Plastic, 3 Pc. - Fits Med. & Std. Size This coupler allows you to quickly change the decorating tip on your piping bag without having to empty the pastry bag Set of 3 Items: [1] Coupler base with attaches to the bag, [2] Medium (7/8") coupler ring, and [3] Large (1") coupler ring This versatile coupler accommodates ALL tips sized: 3/16", 3/8", 1/4", 5/16", 7/16", or 1/2" Made in Korea Made of Food Safe HDPE Plastic