304 stainless steel construction ensures durability and resistance to corrosion, making these caps perfect for laboratory use.

Includes 20 pieces in a set, providing ample supply for various laboratory applications and experiments.

Compatible with multiple sizes of test tubes: 13mm, 15mm, 18mm, 21mm, and 25mm, offering versatility for different lab needs.

devised for secure sealing of laboratory glass tubes, preventing and ensuring sample integrity.

Ideal for use in research, educational, and industrial laboratories, these caps are essential for any lab setup.