Perfect vision: Our door spy TN010.1 uses stainless steel optical elements and 200 wide-angle detection to provide you with a clear external vision and is protected by the inner cover. Perfect vision: Our door spy TN010.1 uses stainless steel optical elements and 200 wide-angle detection to provide you with a clear external vision and is protected by the inner cover. Easy Assembly: With Spy or Door Viewer, you'll get an assembly and video guide. After drilling with 16mm, the spy can spin the door. Highest quality: special material selection, together with the high quality standards of Stopwerk, guarantees a real glass peephole. Super quality, durable General: Due to special design, our door spy can be installed on doors with a minimum thickness of 35mm to a maximum thickness of 55mm. Easy to operate: Our door spy can be operated intuitively by anyone in the family. The use of scratch resistant glass surfaces minimizes the risk of damage.