SS Double Action Spring Hinge(GT13G0001) use stainless steel refining and surface, single, double Product categories and performance:1 this product USES stainless steel ... door to 180 degrees, open and close automatically, can make double play next door negative 180 degrees, can automatically shut off ... inchesDouble play next: 4 inches, 5 inches, six inches SS Double Action Spring Hinge(GT13G0001)