Test Tube Rack for 21 tubes, maximum  diameter 30mm. Stackable and steam autoclavable up to 121 degree Celcius. Can be disassembled for storage. Accepts Test Tubes: Minimum height 2.5″ / 62mm, suits to hold 25mm diameter test tube. Dimension: L 9 3/4 ” x W 4″x H 2 1/2″ Available colours – White / Blue