Phase Lock LoopsPARAMETERSProduct Name: 304 Stainless Steel Security Door Chain LockMaterial: 304 Stainless SteelColor Brushed Silver/Brushed Gold/Red Bronze/Green Bronze/BlackApplications: Door Latch Lock, Window Latch, House Gate Anti-theft Lock, Hotel Room Security LockPackage includes: 1 x lock FEATURES:Thicken Chain, Thicken Basement, more durable!2 Intallation ways: screw installation Any installation direction is available: you can make it vertical, horizontal or oblique direction.