International Door Closers Model 210S with "S" type Adjustable Side Load Arm Assembly - ADA (Handicap) with 8.5 lb. spring tension for Exterior Doors - 105 Degree Backstop with Hold-Open function for Center Hung Doors 105 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 opening force. For use on center pivoted installations - UL Listed Stable hydraulic door check fluid for any climatic operation and constant lubrication