Jw winco – 7117000 – plastic solid disk handwheel w/retractable handle 3.94″ dia x .16″ pilot hole these disk handwheels with retractable handle are distinguished by modern designs. An excellent choice for light-medium duty applications. In the operating position, the handle is secured in the engaged position. To fold it down, it is drawn out from the engaged position. A compression spring secures the handle in either position. Maximum heat resistance of phenolic plastic: 150c (300f).