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Engine Pro Performance Steel Moly Race Rings 43SM8557 Engine Pro Performance Claimer MolyEngine Pro Performance Steel Moly Race Rings 43SM8557 Specifications Sizes: Std, . 005, . 020, . 025, . 030, . 035, . 040, . 045, . 060 Bore Sizes: 4. 1250, 4. 1300, 4. 1450, 4. 1500, 4. 1550, 4. 1600, 4. 1650, 4. 1700, 4. 1850 Sold in a Set of 8 Applies to: . 043 1 16" 3 16" Low Tension Description: None TOP RING: STEEL, PLASMA MOLY SECOND RING: CAST IRON, REVERSE TORSIONAL TWIST or Ductile Iron, Napier (Part #'s: 43SM5597, 43SM8531, 43SM8556,