This crank casing is made of one piece cast aluminum.

Inside are gears made of harden steel with bidirectional self locking mechanism.

It is the most popular model on the market, every grower is using it.

With this manual crank, you to roll up the greenhouse film easily and quickly, ensuring that the air in the greenhouse can circulate naturally and promoting the healthy growth of your plants.

Use 3/4 inch EMT conduit to connect to the side wall window roll bar (bolt screw included, conduit not included).