What is this?The Rubber Tapered Plug is great for laboratory utensils such as flasks, test tubes, or other laboratory applications, also can as a sewer plug, water pipe plug, or drain plug.What will I get?The tapered plug is in size of:33mm - 41mm : Bottom Diameter: 33mm / 1.3 inch; Top Diameter: 41mm / 1.61 inch; Height: 25mm / 0.98 inch; Hole Diameter: 5mm / 0.2 inch42mm - 50mm : Bottom Diameter: 42mm / 1.65 inch; Top Diameter: 50mm / 1.97 inch; Height: 25mm / 0.98 inch; Hole Diameter: 5mm / 0.2 inch;48mm - 56mm: Bottom Diameter: 48mm / 1.89 inch; Top Diameter: 56mm / 2.2 inch; Height: 25mm / 0.98 inch; Hole Diameter: 5mm / 0.2 inch;54mm - 64mm: Bottom Diameter: 54mm / 2.13 inch; Top Diameter: 64mm / 2.52 inch; Height: 25mm / 0.98 inch; Hole Diameter: 5mm / 0.