Eclipse Stainless Steel Bearing Hinge Grade 13 (120 Kg Total Door Mass) These are used on yachts or areas that have high saltwater in the air like seaside towns etc SUS 316 Marine Grade Material Stainless Steel CE 2812, UKCA 1121, Certifire CF336 BS EN1935 Performance Tested 200,000 Cycles To Grade 13 BS EN1634 Fire Tested FD30, 60, 90, 120 Minute Timber Door. FD240 Minute Steel Door 102x76x3mm 12 Guage Countersunk Supplied With 12×1.1/2″ Pozi Drive 3/4″ Threaded Screws Supplied as of Pack of 2