The Heathrow Microtube Storage Racks 80-Well organize a large number of microtubes on the bench top. They are made of extremely strong acrylic and hold up to eight 80-well microtube racks filled with either 1.5 or 2.0 mL microtubes. There is plenty of room to slide the racks in and out. The vertical rack measures 236 x 157 x 234 mm. The horizontal rack measures 310 x 236 x 122 mm.