A manual crank for a greenhouse is a hand-operated device used to open and close ventilation windows, roll-up sidewalls, or shade systems in a greenhouse. It's a simple mechanical tool that lets you control airflow and temperature without needing electricity or an automated system.

Our manual cranks have been exported to more than 60 countries all over the world. The product is produced under stricktly quality control as per Japanese quality control system.

It is very reliable performance, with 3 years limited guarantee.

The product features:

Easy to install and operate, big torque output and light weight, side and roof poly greenhouse application, strong selflocking.