These strong metal clips will hold your springs firmly into place when affixed with no-sag nails and hammered shut. They will hold either spring firmness (firm or stiff) for seats and backs. These clips allow quick and easy installation of sinuous/zigzag/no-sag springs. Use with no-sag nails and install on top of the frame every few inches apart from front-to-back or top-to-bottom on the seat, back, or ottoman. Each row of spring requires two clips.