First, you need to decide on the height. I recommend using a short person to gauge this. They sell a few styles of peep holes at any hardware store. Pick a color that matches your other hardware. It will probably come with a template to help you line up the hole and drill through your door. Once the hole is set, it just screws in. One piece from the exterior and the other piece from the interior like door knobs do.
I would like to put a small viewer thru my garage door. I want to know that no one is outside when door is opened. Is one better than another. Will they take the cons...
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First, you need to decide on the height. I recommend using a short person to gauge this. They sell a few styles of peep holes at any hardware store. Pick a color that matches your other hardware. It will probably come with a template to help you line up the hole and drill through your door. Once the hole is set, it just screws in. One piece from the exterior and the other piece from the interior like door knobs do.
You can purchase a peep hole kit online or at a home improvement store. Simple to install.
Use a small round drill bit, the get the eye from a hardware store.