ROBUST CHROME COLUMN. A UNICOL AND INSTALLER STAPLE. UNICOL standard columns are compatible with most of the product catalogue to provide customisation. Ceiling suspension columns are ideal for ceiling and floor-to-ceiling installations as they incorporate a through-bolt hole at the top and bottom for secure suspension. Each column has a 50.8mm diameter, providing plenty of space for cabling and making it ideal for floor-to-ceiling and suspended installations.