Suitable for use with any of our unsprung knob sets or 57mm centre unsprung lever lock handles. Will match any of our aged brass or polished brass products. For matching rebate kit, see product code 91830. Equipped with an extra strong spring to ensure our weighty knob sets and levers always return to position. Case Size:109mm (H) x 17mm (T) Case Depth: 64mm Backset: 44mm Centre: 57mm Forend Size: 162mm (L) x 26mm (W)