1. High quality optical lens with 180-degree visual angel offers a crystal clear view with an extraordinary wide angle coverage.2. Durable Solid Brass metal with super simple installation. Suitable for 1-3/8" to 2-1/4" thick doors, simply drill a suitably positioned 9/16" diameter hole, insert the viewer into the hole then screw the two sides together and tighten by hand. 3. A solid, heavy duty viewer cover increases your privacy. 4. Fast Delivery with FIVE YEAR REPLACEMENT WARRANTY   Specification: Condiiton: 100% Brand New Color: Sliver Material: Stainless steel Suitable for opening: diameter 14mm Suitable for door thickness:35-60mm Degree: 180 Quanlity:1 Pc.   Notice: Please allow 1-3cm error due to manual measurement and make sure you do not mind before ordering. Please understand that colors may exist chromatic aberration as the different placement of pictures.   Package Included: 1 x Door Viewer