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Extruded aluminum lock with steel thumbscrew for use on metal horizontal sliding windows. For heavier-duty locks see item no's U-9800, U-9802, U-11127, U-11128, U-9810 or U-9812. Finish by tightening thumbscrew with pliers to securely lock windows. Secondary Lock Fits up to 1/8 In. thick rails Allows window to lock in ventilating position Easy to Install This secondary lock is constructed of aluminum and is used to lock your window in an open, ventilating position. It can fit up to a 1/8 In. wide rail. Comes in a nice natural finish. This secondary lock is constructed of aluminum and is used to lock your window in an open, ventilating position. It can fit up to a 1/8 In. wide rail. Comes in a nice natural finish.

