Notes: Size .020" Material Grade Premium Material UCR-Carbon Steel; LCR-Ductile Iron; OCR-Cast Iron Facing UCR-Plasma-Moly; OCR-Chrome Axial Height UCR-2.31mm; LCR-2.0mm; OCR-3.46mm Ring Type UCR:RFK-13PF; LCR:RBT-17; OCR: GCL-40URW Single Cylinder Set (6.0 V8)