The Sargent 8204-LNJ-26D is a Grade 1 Heavy Duty Storeroom or Closet Function Mortise Lock with an LN Rose, a J Lever, an LA Keyway, Keyed Random, and comes in a Satin Chrome Finish. Sargent 8204 LNJ 26D has a 2-3/4" backset, and is for use on 1-3/4" thick doors.