Engine Piston Ring Set -- Size Standard; Material Grade Premium; Material UCR-Carbon Steel; LCR-Ductile Iron; OCR-Carbon Steel; Facing UCR-Plasma-Moly; OCR-Gas Nitride; Axial Height UCR-3.0mm; LCR-2.0mm; OCR-2.5mm; Ring Type UCR:RFK-13PF; LCR:THM-17; OCR: MCL-42NGAW; Engine Set