Door damper unit for interior, swinging doors Grips door at final 10 and softly, self-closes doors more gently compared to other door closers, putting less stress on the hinges Invisible design minimizes visibility of the hardware Recommended Door Specifications: Thickness: minimum 33 mm (1-5/16"), Width: maximum 914 mm (3' 0"), Weight: 15~40 kg (33~88 lbs) Can be adjusted for door weight after installation. Counterplate position can be easily adjusted by removing cover and turning micro-adjustment screws Can be used with HES hinges (P.180~189), sold separately Includes screws and paper template for installation.