Alpro screw-in cylinders offer a 5 pin mechanism ideal for aluminium doors. These screw-in cylinders are designed for use with narrow stile deadlocks and deadlatches. Supplied boxed singularly. SKU: SCREWIN Categories: Alpro, Cylinders, Cylinders & Barrels, Cylinders and Barrels, Locks and Security, Locks with Extra Cut Keys Available, Manufacturer, Multipoint and UPVC, Screw-In Threaded, Shop Front Hardware Tags: Alpro, drox-brand Brand: Alpro