International Door Closers 212-S with "S" Type Adjustable Side Loading Top Arm Assembly - ADA (Handicap) with 8.5 lb. opening force (Exterior Door) - 90 Degree Backstop with (HO) Hold-Open function - Overhead Concealed Door Closer - Center Hung 90 Degree Backstop - Hold Open Suitable for Exterior Doors from (36 Closing and Latching speeds controlled by separate regulating valves fully adjustable after instal ADA (Handicap 8.5 lb.opening force. For use on center pivoted installations - UL Listed Stable hydraulic door check fluid for any climatic operation and constant lubrication