This test tube rack can hold test tubes right side up or upside down for drying. It is an alternative to the wood or metal racks. This polypropylene rack has six openings of 25 mm diameter on top plate, with hemispherical wells and six drying pins. This rack measures (L x W x H) 240 x 70 x 90 mm and it has an open side for clear viewing. This test tube rack offers a cheaper alternative to the more expensive wooden racks and the quality difference is marginal.