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Three sizes available: 5/8" (15mm), 1" (25mm) and 1-3/8" (35mm) outside diameter. The inside diameter measurements are: 7/16" (11mm), 3/4" (19mm) and 1-1/4" (32mm). Tubes are HD plastic and have very little taper. Use the 1-3/8" tube to fill fibrous casings and old fashioned middles. The 1" tube is great for filling hog casing or 32mm collagen. Use the 5/8" tube for snack sticks and breakfast sausage. 5/8" tube will fit 19mm and 21mm casings.