Add to Cart S-5! S-5! S-5-U Clamp Size U Universal Clamp for Standing Seam $8.00 S-5! S-5-U Clamp Size U Universal Clamp for Standing Seam S-5!® clamps attach to the panel seam by the tightening of two "bullet-nosed" stainless steel setscrews against the seam material. (This is usually done... Compare Add to Cart Add to Wishlist