This is the optional Flywheel for the following O.S. Engines: / OSMG1610 - 18 CVR-M OSMG1611 - 18 CVR-MX / OSMG1618 - 15 CV-M OSMG1619 - 15 CV-MX / / FEATURES: Blue anodized aluminum construction for good looks / Cone shaped for with a groove for starting belts such as PRAP1220, / PRAP1230 and PRAP1231 / Steel tapered collet grabs the flywheel & holds it to the crankshaft / The included 4x50mm steel shaft aids in the installation and removal / of the flywheel / / INCLUDES: One aluminum flywheel / One tapered collet / One 4x50mm steel shaft / / REQUIRES: Installation / / SPECS: Length: .77" (19.5mm) / Inside diameter: .35" (9mm) tapering down to .26" (6.5mm) / Outside diameter: 1.22" (31mm) tapering down to 1" (25mm) / Belt groove width: .20" (5mm) / / kpm02/16/2006 / ir/jxs