This newly designed 5kg (11lb) counterweight (CW) uses compression ring to lock the CW onto a CW shaft. Comparing to traditional "point contact" locking mechanism via a locking screw and a pin, the compression ring provides more secure locking method through distributed surface contact.
This CW is designed for following iOptron Mount:
CEM70/CEM70EC/CEM70G
CEM60/CEM60EC
GEM45/GEM45EC/GEM45G
CEM40/CEM40EC/CEM40G* (for late version with 28mm CW shaft)
iEQ45 Pro
iEQ45
It can be used for other mount with a 28mm diameter counterweight shaft.