Door lock body / lock case 1.C to C:57 mm Backset :57 mm 2.Three levers 3.Stainless steel forend 4.Zinc or brass bolt Door lock body / Lock case Model: 3041.Center to center distance (C to C):57 mm.2.Backset :57 mm.3.Levers: 3 levers.4.Forend plate (in lock body):Thickness:2.0mm ,Stainless steel,Brushed.5.Case cover board:Thickness:1.2mm,Galvanized sheet.6.Striker plate:Thickness:1.6mm,Iron, ...