Made of high quality durable metal Easy to install using the four included mounting screws Older and disadvantaged groups who open the door are more comfortable Chain length: 18cm Actual size: weight 0.120 kg; lock plate about 12cm x 2cm (length x width); small plate about 6cm x 2cm (length and width); fixing screws: length 3 cm Silver chain sliding security lock This easy to install sliding chain lock can provide greater security for your home or workplace. Made of high quality durable metal, suitable for wood and metal door frames. Features Made of high quality durable metal, Easy to install, with four mounting screws attached Elderly and disadvantaged people who answer the door are more comfortable Chain length: 18cm full size: weight 0.120kg; weight: 20 cm. The lock plate measures approximately 12cm x 2cm (length x width); the small plate measures approximately 6 cm x 2 cm (length and width); the fixing screw: length 3 cm Content 1 x set of silver chain sliding locks 4 x fixed Screw