Test tube rack, PP Yellow. Hole dia 13 mm Hole format 6 x 15. Large capacity racks. Autoclavable at 121 C for 20 mins. Can be used dry and in water baths. Will not float. Special design allows samples to be incubated at same temperature. Can be used in freezers without deforming or becoming brittle. Will not rot, rust or deform A lpha numerical grid reference on top tier for easy identification of samples. Colour coded. Stackable when empty.