The No 3402BF Bommer self-closing hinge is operated by an internal spring. The tension is adjustable. It is generally specified for industrial,commercial, and residential conditions which require doors to be self-closing. The hinge is UL listed for fire door applications, and is available in a range of sizes for 1-3/4″ to 2-1/4″ thick doors. Please provide door weight, height, and thickness when ordering. The hinge is shown with ball finial button tips are also available. Various finishes are available.