Scandinavian Oval For use with ASSA Modular, Connect and Narrow Profile lock cases. The cylinder is fixed to the lockcase with two hardened steel screws, supplied with the accessory set. ASSA accessories must be used. 3901 - Single Cylinder (External)For use with ASSA Modular, Rim, Connect and Narrow Profil… 3902 - Double CylinderFor use with ASSA Modular, Rim, Connect and Narrow Profil… 3903 - Single Cylinder (Internal)For use with ASSA Modular, Rim, Connect and Narrow Profil… 3907 - Single Rim Cylinder (External)For use with ASSA Modular, Rim, Connect and Narrow Profil… 33907 - Single Rim Cylinder (Internal)For use with ASSA Modular, Rim, Connect and Narrow Profil… 133907 - Double Rim CylinderFor use with ASSA Modular, Rim, Connect and Narrow Profil…