These inserts are made to fit a standard US 2 Inch net/mesh/slit pot. The actual diameter of the insert is about 1.938 inches. You get Die Cut 1/2 thick high quality neoprene foam inserts. We use the highest quality neoprene foam available. These inserts are replacements for the Clone King 25 sire aeroponic cloner as well. DOES NOT FIT A CLONE KING 36 or 64! YOU NEED A 1.75 INSERT