Emtek 8556 Tuscany Bronze Single Sided Deadbolt - Lost Wax Cast Bronze For interior installation and appearance Operated by thumbturn from inside only No Cylinder or Collar Standard door thickness of 1-3/4". Specify if thicker. Specifications:Backset: 2-3/8" or 2-3/4"Cross Bore: 2-1/8"Edge Bore: 1"Door Thickness: 1-3/8" to 2"Keyway: Schlage CMaterial: Brass