Durable construction ensures long-lasting use and resistance to chemicals in laboratory environments. devised for various tube sizes from 1.5ml to 100ml, accommodating a wide range of laboratory applications. Features multiple hole configurations (8, 10, 18, 24 holes) for optimal organization and accessibility of test tubes. Thickened devise provides enhanced stability, preventing tipping and ensuring secure placement of test tubes. Ideal for use in laboratories, educational institutions, and research facilities, making it a versatile tool for scientists and students alike.