The difference between hook ball and spiral.

Metal parts have different shapes and different rotation angles.

1, the metal parts have different shapes. The metal part of the hook bulb has two small protruding cylinders, and the metal part of the spiral bulb is a thread with a large spacing.

2. Different rotation angles. Hook-shaped bulb rotates about 30 degrees to be stuck in place, and spiral bulb rotates clockwise for many times to be stuck in place.