BC Imports Swiss Corner Clips Metal Frame Clips for Pictures up to 30 x 30 inches, 15 Sets of 4 Clips (Bulk 60 Pack)Swiss Corner Clips are an inexpensive, yet classic contemporary method for hanging prints. Clips are made from strong and durable stainless steel. Just four spring loaded arms will hold a medium sized picture up to 20" 20" and up to 3 8" total thickness. Use sturdy mat board, plywood, or masonite as backing, and framing glass or clear acrylic sheets as a protective covering (not included). Because these clips rely on the rigidity of the glass and