N&C Overhead door closer - Silver cover plate and silver arm. Suitable for both internal and external doors between 850mm - 1400mm or 40-120kg Max weight. Dual handed for either push or pull operation. 120 minute fire rating. Power size 3-6. Adjustable power by spring, meaning the closer can remain fitted whilst adjustments are made. Back check function to prevent door from being "over-extended" and causing damage to person or property. Delayed Action to allow slow moving pedestrians to pass through unhindered by the closing door. Closing and latch speed adjustments. 10 year guarantee. Heavy duty fire rated door closer.