Specification: This highest standards quality glass lens door viewer with 180 degree offers a very clear view with an super wide angle .You can easily view the visit outside ,It will definitely avoid the unexpected visitor and  offer security and safety you and your family.   Specifications: Condition: 100% Brand New Made of durable brass .B59 brass give our product long lifespan Wide angle can see a lot of area,no one can hide outside There are many different size of door viewer ,it can fits all your requirement . Cover is also available if you need ,it can avoid others to see you though your door viewer and also dust proof.   Package Included: 1 x Door Viewer One door viewer in one plastic bag ,and then in one small box ,12pcs in inner box ,500/600pcs in one carton.   How to choose a suitable door viewer: Please take part the old door viewer at first and measure the size of hole; if there is no door viewer, please measure the thickness of door. If you have old door viewer ,you can measure it’s tube size and your door thinkness .   How to install your door viewer: 1.  drill a suitably hole 14mm, 2. Insert the lenses from the outside of door. 3. Insert the base from the inside. 4.screw two pars together ,tight by your hands or screwdriver   Wenzhou Jifu Hardware Co., Ltd. was founded in 1999, formerly known as Wenzhou Xiangyang decoration factory(founded in 1985), through social change and corporate restructuring, Jifu’s hard-working and innovative quality is unchanged. Main products: door viewer, door handle, door knocker, furniture handle, door stop and all kinds of door hardware accessories.