Package:A Pack of Plastic 8-Well Test Tube Rack Material:plastic Size:approx 24.5cm X 7cm X 8cm(L X W X H),20.6mm in hole diameter Made of premium material,durable,safe to use.Thick bottom, not easy to damage and strong. Well design,can prevent test tube from detaching,easy to put,easy to take.A great tool for scientific project. It can be conveniently used as a drying frame for glass plate or inverted tube.The spacious hook design makes it easy to insert and remove pipes.