Handwheels typically perform one of two operational tasks. They enable movement and precise adjustment to machinery or carefully open and close a valve. Because they perform various functions in many different applications, handwheels come in a wide variety of types and sizes.

Some handwheels are gently moved by fingers making fine adjustments to everything from medical to measuring devices. Other handwheels are used to turn valves controlling the flow of oil and gas. These handwheels are quite large and require the ability to transmit a lot of force to the wheel to turn it.

Small wheels are utilized for adjustment and require no more than finger force. These are typically made of durable plastic or lightweight metal like aluminum. Larger wheels are typically made of cast iron. 

When more force is required to over come adjustment resistance in any type of handwheel, a crank handle can be added to enable more force to be exerted.