From the front, Swiss Corner Clips look the same as Swiss Clips. The spring-loaded arms of these stainless steel corners hold any size or shape of glass, picture, mat and backing, mat board, foamboard, masonite, etc. up to 3/8" (10 mm) thick and up to 30" × 30" (76 cm × 76 cm).
The system, which uses a nylon cord (provided) to pull the corners together, supports up to 60 lbs. A hanger bracket is also included.
Each package contains 4 clips.