PULLED DOWN ON REAR DOOR STRAP, AND ONE ATTACH BRACKET BROKE WITH RIVET STILL ATTACHED TO STRAP. THE DOWNWARD MOTION BROUGHT MY HAND ACROSS THE RIVET, RESULTING IN A HAND CUT. ONE END OF THE ATTACH RIVET IS SMOOTH AND THE OTHER END IS KNIFE SHARP. THE REPLACEMENT STRAP PURCHASED FROM GM DEALERSHIP IS SAME DESIGN. IF BOTH ENDS OF THE RIVET WERE SMOOTH, NO INJURY WOULD HAVE HAPPENED. *TR