Bel-Art F18794-0001 Poxygrid Centrifuge Tube Rack; 50ml, 16 Places, 6 x 5 x 3 in., Blue Epoxy coated steel wire is chemical and corrosion resistant and steam autoclavable at 121 degree C (250 degree F) Supports 50ml plastic centrifuge tubes in individual wells, each 30mm square Use to organize tubes for storage and processing