Residential Grade Double Acting Floor Hinge BB159 – (ANSI K82183) – Steel – satin brass finish (US4) Features : • For low frequency residential double acting wood doors 1 3/8” to 1 3/4” thick weighing up to 75 lbs. • Holds door open at approximately a 90º angle on either side of opening • Ball bearing located at the top of the hinge carries the weight of door and takes the thrust of spring • Hardened steel roller, working with the cam, insures easy and noiseless operation • Spring tension is fully adjustable • Set consists of top pivot, horizontal floor hinge, decorative plates, fasteners, and installation instructions.