50ml large test tube, 4-hole test tube rack, large test tube observation is more convenient. Stable material, smooth appearance, safe and stable material is more suitable for experiments. The test tube rack is 4cm wide, stable support, and the test tube can be covered to store the solution. Anti-slip socket, the test tube is firmly fixed on the test tube rack. As fundamental equipment for any chemistry workspace, this rack supports various experimental procedures. Suitable for educational institutions, research facilities, and professional ., Manufacturer: WENYAZIGUO