With metal fiberglass or composite doors use a standard bit.
Drill keyhole in door.
Most interior locksets have a 2 and 3 8 inch backset.
Depress the drill trigger switch smoothly and cut a hole through the first metal cladding layer on the door through the foam core and then through the far side of the door s cladding.
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For a splinter free hole through a wood door use a brad point bit.
When installing a peephole on a wood door start drilling slowly from the exterior side of the door first and stop when the tip of the bit sticks through the interior surface to keep it from splintering.
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Make an indention on your mark with a center punch or the point of a nail to keep the drill bit from walking when starting the hole.
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Exterior locksets commonly have a 2 and 3 4 inch backset.
It can be difficult to make the keyholes straight but it can be done with a router and a steady hand.
The backset is the distance from the edge of the door to the center of the giant hole you drill in the face of the door.
When making coat racks doors or other interior items for your home it can help to make keyholes with a drill bit.