Fast and easy way installing hinged surfaces. Use CA hinges for small parkflyer type applications up to 1/4 scale model airplanes. Simple installation, cut a slot with hobby knife, insert CA hinge and use few drops of thin CA glue. Dimensions: Small: 7/16” x 5/8” (11mm x 16mm) Large: 3/4” x 1” (19mm x 25mm)