Table columns are available in 40 mm, 60 mm, 76 mm and 100 mm diameters. These columns are made from extruded aluminium tube with an anodised thickness of 15 - 20 microns. The range comprises 40, 60, 76 and 100 mm diameter tube for the fixed height columns and 76/60, 100/76 and 100/76/60 mm for the adjustable telescopic columns. Bushing for the adjustable columns is made from Delrin plastic which has natural lubricating properties.