Double action spring hinges give closing action from either direction. Energy is stored in the spring as the door is opened, and closes the door after it is released. Spring tension is adjustable at any time. Models are available for doors without hanging strips, and sizes are made to operate door weights, per pair, from 25 pounds to 70 pounds, in thicknesses ranging from 3/4" to 1 3/4" (not all thicknesses work with all models). Finish for model (070) is sprayed brass.