Makes removal and installation of heavy truck flywheels much easier. One of many accessories for the popular AFF clutch jack. Makes your jack the most versatile on the market when you purchase all of these specialty accessories. Or, just get the accessories you need for your specific application. The flywheel adapter replaces the spline quickly and easily and can bolt onto pot style, or flat flywheels found on 14 and 15.5 inch clutches. Much easier job that when attempted without this accessory. As always, time is money.