Hey building managers and homeowners, this NHN concealed door closer is one of those smart upgrades that makes life so much easier! Installed right in the pivot, it's completely hidden from view - no more bulky door closers messing up your clean aesthetic. The matte black finish looks sleek on modern doors, and it uses the latest cam type technology that gives you easy opening with increased efficiency on the closing torque. What's really handy is the hold-open function at 90 degrees - perfect for those times you need to move furniture through or just want to let some fresh air circulate. The closing speed is easily adjustable via two independent adjustment valves, so you can set it to close gently or more firmly depending on your needs. It's suitable for timber, aluminum, and steel doors with some specific requirements: door weight between 132 to 220lbs (60 to 100kg), width from 29-1/2 to 37-3/8 inches (750 to 950mm), and minimum thickness of 1-9/16 inches (40mm). Installation is surprisingly straightforward and costs less time since no floor preparation is needed - it's all in the pivot system. Whether you're installing in offices, commercial spaces, or even modern homes where you want doors to close automatically without visible hardware, this closer delivers professional performance. The narrow style with high performance means it works great even in tight spaces. One of those 'set it and forget it' solutions that just works day after day, keeping your doors functioning properly and saving energy by ensuring they close completely every time.