This 4.5kg counterweight will fit the following iOptron mounts:
CEM26
GEM28
CEM40/CEM40EC (early version with 20mm CW shaft ONLY)
iEQ30/iEQ30 Pro
CEM25/CEM25P/CEM25EC
ZEQ25
AZ Mount Pro
MiniTower Pro
MiniTower II
MiniTower
It can also be used for any other mount that has a 20mm diameter counterweight shaft.
iOptron Product Code: 3006-10