Product Description This lock cylinder is constructed from zinc diecast and plated in brass. This cylinder is used on jimmy proof and night lock style lock systems. It features a Segal keyway with adjustable tail length. Comes keyed differently. From the Manufacturer This lock cylinder is constructed from zinc diecast and plated in brass. This cylinder is used on jimmy proof and night lock style lock systems. It features a Segal keyway with adjustable tail length. Comes keyed differently.