The door safety chain latch is intended to recognise a caller before the door is fully released, so preventing forced entrance. Allows the door to open to a 30-50mm wide gap for a secure view of the outside The high strength steel frame makes it very resistant to forced entrance, ensuring safety Installation requires no drilling or chiselling. It cannot be opened from the outside after installation; safety lock provides dependable protection for hotels, hotels, doors, storage rooms, windows, and so on Each door chain comes with 7 pieces of screw Recommendation: replace after every attempted entryColor: Chrome Manufacturer: SDTOOLS Model Number: 1 Part Number: 1890 Size: 2 piecesDoor Bar Restrictor Door Chain Lock for Front Door Swing Bar Door Guard Reinforcement Lock Latch Security Chain Restrictors Door Guard to Prevent Forceful Entry