A long taper and full radius prevents nicking and scratching of crankshaft journals during connecting rod installation. ARP rod bolt extensions 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. PartNumber : arp910-0005 Description : Rod Bolt Extension Kit Size : 5/16, 3/8 & 7/16in Engine Components::Rod Bolt Kits