Sliding Window Lock, 3/16-inch, Extruded Aluminum, Aluminum. Color This sliding window lock is constructed of an extruded Aluminum housing with a diecast cam-action lever, and it comes in an Aluminum colored finish. The design of this lock is manufactured to fit on older style, metal framed, horizontal sliding windows and#x0096; usually of single pane glass, with a maximum fin thickness of 3/16 in For vinyl windows consider using Prime-Line model numbers U-9809 or U-10547. This lock can be used to securely lock windows in closed or ventilating positions. These locks are easy to install and are used by many to increase the security of their home.