The Sargent 1131 HU TB Door Closer With Hold Open Is a Surface Mounted Grade One Size 1 Door Closer For Commercial Applications, Features Full rack and pinion, High strength cast aluminum case, Tri-packed for versatile mounting: standard, inverted or parallel, Arm leverage adjustment, One-piece spindle heat-treated for high strength, Separate key-controlled regulating valves for door closing and latching speed and comes with Thru Bolts. The Sargent 1131 HU Door Closer Is Non-Handed and adjustable from sizes 1 through 6: Door closers to meet handicapped 1131 requirements or for light through medium weight interior doors, ANSI Grade 1 A156.4, Adjustable backcheck valve is standard, For Use Hotel/Motel guest room, Retro-fit on storefront entry doors, Retail buildings, Interior office doors, Assisted living centers, office buildings.