The diammeter of these stuffing tubes are 1-9/16" at the connecting point to stuffer. Tubes are 6" in length. Tube openings are 5/8", 3/4" & 1" where casings are applied. Sold in sets of 3 only. These plastic stuffing tubes will fit Sausage Maker's, Choprite and Enterprise 3-lb and 5-lb stuffers.