We listened to concrete contractors in the US who demanded a column form that is light, strong and available in US measurements. May we present - The PERI DUO Imperial Sized Column. Columns are adjustable in two-inch increments, allowing for column sizes from 4x4 inches up to 24x24 inches. The low weight of the forms is achieved by using a special fiber-reinforced polymer. Panels come in two sizes and are clamped together in seconds with only a small number of accessories needed. The DUO column is second to none in terms of simplicity, lightweight and speed of installation, all while maintaining a pour pressure of 1650 psf.