Images used may be generic. Actual product may vary. ACL Race Series Rod Bearings Nissan 1998cc SR20DE / DET Size .50 ACL Performance Race Bearings are manufactured with a tri-layer metal with a hardened steel backing in order to withstand high RPM conditions, high stress loads, and high temperatures. Each ACL race bearing design features the following Large chamfer to accomodate larger crankshaft fillets 3/4 groove to provide optimum oil supply to rods and to maximize load carrying capacity Incresed crush and tighter wall tolerance for better seating Improved overlay and reduced thickness for increased fatigue strength Hardened steel backing to maintain crush under high loads and temperatures Size .50