A ratchet handle is a combination of a crank and ratchet that allows quicker, easier, and safer machinery adjustment. The ratchet design allows convenient reversal of the handle direction.
The main ratchet handle types are as the following pictures describe.
Gear to Gear Lever Change Ratchet Handle
Twin pawl Round Head Ratchet Handle
Facom Type Round Head Ratchet Handle
One pawl Round Head Ratchet Handle
Gearless Ratchet Handle
Stanley Type Lever Change Ratchet Handle
Koken Type Lever Change Ratchet Handle