Description: - Plastic 16mm/50 Vents 3 Layers Lab Test Tube Rack Holder Pipe Stand School Laboratory Supplies - Made of high quality plastic material, 50 holes, double layers, each socket is 16mm diameter - Perfect for laboratory, provide clear view of the tube contents and convenient insertion and removal of tubes - Material: Plastic - Color: BluePackage Includes:1 Piece Test Tube RackDiverse products; High quality; Best price; good customer Service; Fast transaction. We will give you a pleasant and satisfying shopping experience!