Global Door Controls Single Cylinder Commercial Deadbolt in Brushed Chrome Certified Grade 3 ANSI A156.5 Backset can be adjusted between 2-3/4" to 2-3/8" inches UL rated R21487 for "A" label 3 hour door Comes with Schlage "C" way keying and 2 standard cut keys Fits doors between 1-3/4" to 2" inches thick Grade 2 certified, ANSI/BHMA A156.4 Backset 2-3/4-Inches For door thicknesses of 1-3/8-Inches to 1-7/8-Inches.