International Door Closers Model 310 BODY ONLY Fixed ADA (Handicap) Multi-sized Overhead Concealed Closer for Exterior Doors - 105 Degree Backstop with Hold-Open function w/range of sizes from 8.5lbs of Opening Force to medium spring tension 105 Degree Backstop (HO) Hold Open - Multi-sized closer w/Adjustable Spring Power for range of sizes Adjustable OHC from 8.5lbs of Opening Force to medium spring tension. Adjustable after installation. Closing and Latching speeds controlled by separate regulating valves. ADA (Handicap) with 8.5 lb opening force for use on center pivoted installations - UL Listed Stable hydraulic door check fluid for any climate. Two Speed Control Valves fully adjustable.