The Carrillo BMW S55 3/8 Pro-H CARR Bolt Connecting Rods (Set of 6) are a high-performance, lightweight connecting rod set designed to provide superior strength and durability for BMW S55 engines. The connecting rods are constructed from a proprietary steel alloy and feature a 3/8 CARR bolt design for increased strength and reliability. The connecting rods are designed to reduce engine vibration and increase power output. They are perfect for high-performance engines and are backed by a limited lifetime warranty.