RivetKing/Celus Steel/Steel Blind Rivets are equipped with pitched mandrel design that is enveloped by the rivet during application to prevent mandrel fallout. Offered in two configurations, Brand All Steel Zinc Plated or Celus Brand, Steel with Phosphate mandrel. Phosphated mandrels reduce rivet gun jaw cleaning, while zinc plated mandrels provide for greater rust protection. the SBS series is ranked #3 in both shear and tensile strength in the open end blind rivet category.