Defender Security U 9809 Sliding Window Lock for Vinyl Windows &ndash; Easy Installation to Keep Windows Securely Closed &ndash; White Diecast Construction (Pack of 2) EACH PACK INCLUDES  (1) Adjustable jaw that fits all vinyl frame rail thicknesses from 1/16" up to 1/2 in. thick. "Vise like" grip holds securely and will not mar frame. Allows window to lock in ventilating position; cam style locking lever; no tools required. This is for Vinyl Windows only. SECURELY LOCK WINDOWS  These U 9809 sliding window locks for vinyl windows help keep them securely closed. The locks feature an adjustable jaw that has a vise-like grip, and they are capable of opening up to  wide. ADD EXTRA SECURITY  Use these sliding window locks to prevent unwanted intruders and avoid falling accidents keeping your windows closed when you want them the most secure! Air and a breeze can get in, but no intruders. FOR USE ON MOST VINYL WINDOWS  These sliding window locks are for use on horizontal sliding windows and most vertical sliding (single hung) windows as a secondary window lock. PRODUCT INFO  These sliding window locks have a diecast construction with a white painted finish and can fit most vinyl frame rail thicknesses ranging from 1/16 to .