【Anti-Theft and Security】The locking angle is smooth, preventing hand injuries. Reinforced locking loop design, not easy to fall off, durable. Anti-collision pad at the bottom of the handle prevents scratching the window frame. It is suitable for all PVC doors and windows. 【Quality Guaranteed】Strong window lock made of zinc alloy, durability and quality guaranteed, white powder-coated, a good match for windows and doors. 【Easy to Use】Rotating design, it can be locked at any angle. Simply turn the jammer arm to lock or unlock the frame. 【Easy to Install】Clean the mounting surface - Screw it in with a screwdriver - Cover with the included screw cap - and you're done to begin your security guarantee. 【Note】Use only for casement windows and doors, not for sliding windows. What are jammers? 1. What are jammers? Door jammers are commonly used as an additional security measure to secure PVC doors or windows and are available in locking and non-locking options. A door jammer will prevent a