Set of 7 autoclavable neoprene rubber adaptors designed to fit Buchner and fritted glass funnels.Sizes 1-7 for filter funnels. Can be used singly or nested with adjacent sizes.Internal Diameters for the top and bottom of the adaptors are as follows:Top: 17mm Bottom: 7mm (2mm wall)Top: 22mm Bottom: 11mm (2.5mm wall)Top: 31mm Bottom: 16mm (3mm wall)Top: 39mm Bottom: 22mm (3.5mm wall)Top: 50mm Bottom: 30mm (4mm wall)Top: 60mm Bottom: 36mm (4.5mm wall)Top: 75mm Bottom: 46mm (5.5mm wall)