Reliable and Serviceable: the security door lock is made of quality aluminum alloy with iron with a sturdy , waterproof and rust proof, the nice materials do not easily fade, deform and break, you could use it for a long time Suitable for folding doors, accordion doors, closet doors, swing doors, and interior or exterior sliding doors. Addtional Extra Security to Your Home. This sliding door lock designed to offer additional home security from a patio door or sliding window, provide peace of mind at night to keep everyone safe in side, use this when you leave home when you travel, also peace of mind for when you are gone Security and Safety for Kids. Our security door lock is great to put on sliding door that leads to the pool, and vinyl sliding glass patio door, no more worrying about if the little open the door run outside, and head for the pool when you weren't looking Colour:silver Material:aluminum alloy Package Contents: 2 x Sliding Door Lock Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.