A Set of 50 Testube With Rim 24x150mm- Boiling Tube.

Product: A Set of 50 Test Tubes with Rim — 24 mm × 150 mm (Boiling Tube)
Quantity: 50 test tubes per set
Size: 24 mm (diameter) × 150 mm (length)
Material: Durable laboratory glass
Design:

Tube with a small rim at the mouth for ease of handling

Thicker glass wall to allow boiling of liquids directly over a flame
Features:

Heat-, acid-, and base-resistant

Chemically inert — non-reactive with most chemicals

Easily cleaned and reusable
Suitable for: Chemistry labs, education, scientific experiments, boiling, and heating of solutions