MEDECO MAXUM DLT SINGLE CYLINDER DEADBOLT BILEVEL 2-3/8 BS COMMERCIAL TRIM GRADE 1 DEADBOLT SATIN CHROME FINISH. Deadbolts are about strength. Just hold a Medeco® ANSI Grade 1 Maxum® deadbolt in your hand, and you know this is one tough hunk of protection. As tough as a Maxum deadbolt is on the outside, it’s that smart on the inside. Maxum® deadbolts offer maximum protection with solid-brass construction, along with anti-drilling and anti-prying features. Single Cylinder Maxum Deadbolt Lock, 1-1/8″ Faceplate, 2 3/8″ Backset. Door thickness: 1-3/8″ – 2-1/2″. Standard 2-1/8″ cross bore and 1-1/8″ edge bore.