This is a good, durable product that is easy to install and gives me peace of mind knowing who's at my door! I installed it in a steel door in 15 minutes and am a total novice with power tools. However, the installation is quite simple: mark the place where you want to install the door viewer; drill a pilot hole; Switch to a larger cutter and enlarge the hole on both sides (I used https://smile.amazon.com/gp/product/B01K45O8FI/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1; unscrew the two grommet pieces , put them on both sides and screw it back in. Looks great I'm sure I won't regret this purchase.
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