Steering wheel：
firmly holds steering wheel in position when setting to eangle.
Has a trigger-controlled mechanism and a thumb lock release.
Pedal depressor (brake gas):
This brake and gas depressor is designed to use the front seat
    of the car to obtain lever age
Place the point end of depressor on the pedal and use the small
    release lever above the spring to free the trigger mechanism in
    order to place the jack in place againt the seat.
Then press the trigger mechanism to put pressure on the brake
     or gas pedal the pedal jack will maintain the pressure until
     the release lever is pressed.