GLASS LOCK 4 WAY 1 SIDE KEY - G TO G A glass lock 4 way 1 side key is a type of lock that is used to secure a glass door or panel with four possible orientations and a key on one side on the other. Specification : 1) 1mm Thickness of Cover Plate, 2) Can be Fitted in 12mm Glass, 3) One side Knob, 4) Big Oval Design, 5) 4 Way Locking System, 6) Useful as Door Lock and Sliding Lock.