Detachable Design: Plastic detachable test tube rack, simple structure, very easy to assemble. Broadly Compatible: This Centrifuge Tube Rack comes in two different sizes of wells, suitable for 10ml / 15ml / 50ml centrifuge tubes and laboratory test tubes. Size information: 8.66 x 3.78 x 1.97in(L*W*H), large well diameter 1.18in, small well diameter 0.64in. PP Plastic: The use temperature range is -20 to 70 ℃, resistant to acid.