This Barnett Scorpion Series clear derby cover is designed to fit OEM primary covers on 1990-97 Harley Davidson Big Twins and features a quarter inch thick, clear polycarbonate window to your clutch! The scratch and discoloration resistant window is firmly secured and sealed with an o-ring gasket. The outer cover area is CNC machined from billet aluminum, then chrome plated. The derby cover gasket is also included. For the ultimate in looks AND performance, install a Barnett lock-up clutch with your new cover!