GLASS LOCK BULLET 1 SIDE KNOB -G TO W 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 and a blind on the other. It is usually made of stainless steel or aluminum alloy and requires a cutout in the glass. A glass lock 4 way 1 side key can be used for swing or sliding doors and double doors. Specification : 1) 1mm Thickness of Cover Plate, 2) Can be Fitted in 12mm Glass, 3) One side Knob, 4) Single Bullet Dead Bolt, 5) Mainly used as Bathroom Lock