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.