Medeco Maxum 11-0102-605 Bright Brass Double Cylinder Deadbolt Key On Both Sides 2-3/8" Backset HIGH SECURITY 00 Keyway. The Maxum deadbolt lock series offers superior physical protection to fit your security needs. Every inch of Maxum is designed with specific features that resist the techniques thieves use to gain entry. The Medeco Double Cylinder Tubular Deadlock features an ANSI Grade 1 rating which can provide the highest degree of residential security. This Double cylinder deadbolt has a solid brass build and a bright brass finish. It is designed to be used with exterior doors. The Maxum is an ideal high-security locking solution for residential, business and institutional use. Please measure your backset prior to placing your order. In the U.S. there are two common backsets for residential locks, 2-3/8" and 2-3/4". The backset is the distance from the edge of the door to the center of the 2-1/8" bore hole.