Abstract: A safety seat belt arrangement comprises a retractor or spool assembly including a spool (20), carrying the seat belt, rotatable in a frame (18) unless blocked by a blocking mechanism (25), the spool assembly including a head member (22) cooperating with the blocking mechanism. A load limiting torsion bar assembly within the spool and acting between the head member and the spool includes a high level torsion bar portion (24), a low level torsion bar portion (26) and an intermediate torsion element in the form of a torsion pipe (36) fixed at its ends with respect to the ends of the torsion bar portion (26).