M12 Replacement Mandrel Replacement Mandrels for Kennedy Rivet Nut Inserters. Features and Benefits Save money by replacing the nut rivet mandrel - instead of buying a whole new riveter! Quickly and easily change out your SAE gun for a metric thread, instead of buying a new gun Notes Includes 1x replacement mandrel Designed for Kennedy Rivet Nut Inserters - sold separately Image shown is the M3 model GBP 2.59 1