- Brushed finish chain door protector is designed to increase wear resistance and corrosion resistance for durable indoor use. - Indoor safety chain lock: simple structure, easy to install and use, fits most doors and windows. - Door safety lock: prevents pets from leaving and stops children from opening doors to strangers; can also function as a window safety chain lock. - Thick stainless steel construction provides high strength, durability, and resistance to breakage, enhancing overall door lock security. - Material and compatibility: thick stainless steel with a brushed finish; suitable for most standard doors and windows. - Performance attributes: durable, high strength, corrosion resistant, reliable for everyday use. - Use scenarios: 1) Keep pets indoors while allowing ventilation. 2) Prevent children from opening doors to strangers in entryways. 3) Add extra security for windows and doors in apartments or homes.