SS Double Action Spring Hinge(GT13G0001) use stainless steel refining and surface, single, double

Product categories and performance:
1 this product USES stainless steel refining and surface, single, double play next next play, Single play next door to 180 degrees, open and close automatically, can make double play next door negative 180 degrees, can automatically shut off.
2 the main production specifications:
Single play next: 3 inches, 4 inches, 5 inches, six inches
Double play next: 4 inches, 5 inches, six inches