The Union 2277 Silver Series 3 Lever Union Mortice Sash Lock boasts a 10 year guarantee & is available in three different cases sizes, 50mm, 64mm & 76mm & two different finishes Brass & Satin Chrome Mechanism: 3 Lever Case Size: 50, 64, 76 & 102 mm Follower 8mm Case Finish: Silver Forend Finish: Brass..