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Engine Pro Performance Ductile Plasma Moly Top Ring - Napier Second Ring 43M8521 Engine Pro Performance Guide PlatesEngine Pro Performance Ductile Plasma Moly Top Ring Napier Second Ring 43M8521 Specifications Size: Std, . 005, . 035, . 045, . 065 Bore Size: 4. 0000, 4. 0050, 4. 0350, 4. 0450, 4. 0650 Sold in a Set of 8 Applies to: 1. 5" 1. 5" 3. 0" Low Tension Description: All the features of our premium ductile series rings, plus the second ring is Napier profile design for superior durability and oil scraping ability. TOP RING: DUCTILE IRON, PLASMA MOLY Impact