The S-5-U ("U" stands for Universal) is a popular and versatile roof clamp. Its generous dimensioning accommodates a majority of the standing seam profiles in North and South America--including most structural and architectural profiles. The U is used on vertically-oriented seams and rotated 90 degrees for use on many horizontal seam profiles. Although there are more cost-effective S-5! options, the advantage of the S5U clamp is its versatility.