HIGH QUALITY - This bathroom mortice lock has a high quality spring mechanism for years of trouble free use NEAT & TIDY - Dust box fits behind the keep to give a neat and tidy finish to the frame REVERSIBLE - Quick and easy to reverse the latch bolt to suit both left and right closing doors CE MARKINGS - Third party tested and approved for use on fire doors FD30/60 SILENT - The keep is adjustable to prevent the door from rattling, Weight: 0.661386786 Pounds, Manufacturer: EAI