International Series 200 Concealed Overhead Door Closer - Model 211 Body Only with mounting brackets. 105 Degree Built-In positive Backstop with (NHO) No Hold-Open Function – ADA (Handicap) 8.5lb. opening force. For use on Exterior Doors with center pivoted applications. Center Hung Doors: Double or Single Acting (Door Stop applied to frame renders unit Single Acting) Suitable for Exterior Doors from (36” to 48” x 96”) – Two speed control Valves: Closing and Latching speeds controlled by separate regulating valves, fully adjustable after installation. Fits an aluminum header or transom bar as small as 1 ¾” x 4” – Positive centering for alignment and to hold door closed against any normal wind or draft. Stable hydraulic door check fluid for any climatic operation and constant lubrication – Body Only - UL Listed with Limited 5 Year Warranty