Lock Case Depth: 92 mm Backset: 60 mm Face Plate: 235 mm features: Euro profile mortice nightlatch Latch bolt operated by lever handle or knob on inside and single cylinder on outside Heavy spring suitable for unsprung furniture A catch operated from the lock forend will hold the latch in the withdrawn position 30 degree follower action for firm positve opening action Positive follower angle of 1 degree reduces the effect of wear which can lead to lever droop The case is galvanized steel, 16mm wide Narrow 20 mm wide single piece forend in grade 316 stainless steel Fixing screws included Radius corner version available to order