A long taper and full radius prevents nicking and scratching of crankshaft journals during connecting rod installation. ARP rod boltextensions act as a guide during piston and rod installation they will also hold the bearing shell in position in some applications. Available in 5/16, 3/8 and 7/16 extensions are packaged in pairs and are hard anodize color coded for ease of identification. Rod Bolt Extension Kit Size 5/16 3/8 & 7/16in