Made of high quality durable metal Easy to install using the four included mounting screws Elderly and underprivileged groups opening the door are more comfortable Chain length: 18 cm Actual size: weight 0.120 kg; lock plate about 12cm x 2cm (length x width); small plate about 6 cm x 2 cm (length and width); Fixing Screw: Length 3cm 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: 18 cm full height: weight 0.120 kg; weight: 20 cm. The lock plate measures approximately 12cm x 2cm (length x width); the small plate measures approximately 6cm x 2cm (length and width); the fixing screw: length 3 cm Contents 1 x set of sliding locks with silver chain 4 x fixed Screw