RWA1671D 2.3/2.5 5.5" rod set is manufactured to our specs by K1 Technologies. Billet 4340 Steel H-Beam design Shot peened for improved fatigue life Premium bronze wrist pin bushings .927 Pin diameter ARP 2000 rod bolts installed Total weight 606 grams Rot. weight 428 grams Recp. weight 178 grams Sold in sets of four