This Yale 8013 dual screw sash window lock, with a polished brass finish, can be used on sash or hinged windows. The Yale 8013 Sash window locks have a threaded lock barrel which is fixed into the inner frame and the window is secured by locking the inner bolt into the barrel and frame using the key. It can also be used in hinged windows. The locks simply screw into the barrel. This Yale YALV80132PL Dual Screw Window Locks are packet in x 2 and are finished in Brass. Includes 1 x Key. 2 year Guarantee.