The standard size of a deadbolt fits into backsets measuring 2 3/8 to 2 3/4 inches. The location of the deadbolt is typically 6 to 12 inches above the key lock. Most deadbolts require a cross bore of 2 1/8 inches in diameter and a 1-inch latch bore
You can upgrade the security of a uPVC door by replacing your euro cylinder lock to an anti-snap euro cylinder lock. Also, a Sash Jammer is an additional security extra that can be locked from the outside or inside and can be added to uPVC doors.
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