This is a A-25 25 Steel Detachable Chain (10 ft) PN: 25Main Description As Following : A-25 25 Steel Detachable Chain (10 ft) P.N: 25 Dim A (1): 45/64Dim B (2): 27/64Dim C (3): 29/32 Crosses To: A-AF409K EUROFILTER , A-B1RV12YC AUTOLITE , A-B1RV17YC CHAMPION , A-B1SB25 ROTARY , A-B1UR4 AUTOLITE , A-B125MA MURRAY , A-FF179 HOLLEY , A-FF179J HOLLEY , A-HF6720 ZINGA , A-HF6720J ZINGA , A-LF647 FACET , A-LF647J FACET , A-LF767 WIX , A-LF767J WIX , Crossed From: 042-T2500 , , 042T2500 , , 2221-22721 JOHN DAY , 25DC , Found in Section & Models : Chains/ Sprockets/ Pulleys/ Hubs > Steel Detachable Chains, (Miscellaneous) (UNDEFINED): SEVERAL Associated Items : New Also This is An Aftermarket Product And : Dim A (1): 45/64 Dim B (2): 27/64 Dim C (3): 29/32