The dead bolt in our front door was a VERY CHEAP copy of the standard entry level Kwikset Residential deadbolt and was becoming worn, so I changed the deadbolt to a mid-priced Schlege deadbolt. A perfect fit in the door, including the 1" round, drive in bolt. I did have to drill the hole for the bolt about a half inch deeper into the square steel framing stud. I keyed it to match the entry door for our house and condo. I did have to remove the stupid "one handed" installation pieces because they wouldn't slip into the fiberglass door skin. One less ket on the keyring.