the column comprises a column body mounted on the frame via brackets comprising openings for the passage of fixing elements to the frame , and capsules enclosing the brackets and retained by the fixing elements . the openings comprise guiding surfaces disposed two by two on both sides of a vertical plane containing the axis of the column . in the event of an impact occurring , the brackets integral with the column body move with respect to the capsules fixed to the frame , the guiding surfaces sliding into the capsules . these movements absorb a portion of the energy due to the impact and the surfaces ensure the axial guiding of the column . the capsules are made of plastics and a metallic insert is inserted between the fixing elements and the capsules . the column is particularly useful for motor vehicles provided with an inflatable safety air bag should an impact occur .