Top Support 165 x 180mm Base Plate dimensions 220 x 260 x 4mm steel. Acoustic Base Plates are £49.99 per pair when purchased separartely 6mm Clear Glass Bases are manufactured to British Safety Standard BS EN 12105-2 and £20.00 optional extra. M8 Zinc plated Alen Key adjustable base isolation spikes supplied as standard. Standard height available 610mm (24") Custom Heights available only in the steel format. Standard finishes are Mercury or Black in steel or White, Natural, Oak, Cherry, Mahogany, Walnut or Black in the solid hardwood finishes 1 bag of Inert Filler recommended per column ( 610mm hieight ) Inert Filler optional extra £4.99 per bag or £34.99 for box of 8 SQ 400 Steel Speaker Stands 610mm (24") high 6mm Clear Glass Bases BS EN 12150-2 £20.00 optional extra per pair SQ 400 Wood Speaker Support Stands 610mm (24") high with Acoustic Top Plates and Steel or Clear Glass base supplied standard.