Radii is a siding gauge for lap siding that has several features to increase efficiency in lap installation. - Accurately gauge siding without perfectly placing the gauge perpendicular to the siding. - Ergonomic polymer handle - CNC milled aluminum - Anodized coating - Stainless steel fasteners - Aluminum reduces the expansion and contraction in comparison to plastic gauges - CNC milling produces highly accurate gauging without variances between gauges. - Adjustable lap dimensions of 5?, 6?, 7?, and 8? - Hex key included.