The hexagonal head is attached to the forcing screw. It is easily rotated with a socket wrench or spanner.
Bearing puller forcing screw
The forcing screw is a long, fine threaded screw that is rotated against the centre of the shaft. When the forcing screw is rotated, it applies a force to the component you are removing.
Bearing puller cross arms
The cross arm attaches the legs to the forcing screw.
Reversible claw legs on a bearing puller
The reversible claw legs allow internal and external pulls.
