Pack of 50 assorted orange rubber stoppers, each with two 5mm diameter holes.
Contains the following quantities and sizes (bottom diameters):

• 10 stoppers each of 4 different sizes: 13mm, 15mm, 17mm & 18mm

• 3 stoppers each of 2 different sizes: 21mm, & 23mm diameters

• 2 stoppers each of 2 different sizes: 25mm, & 29mm diameters.

The durable, rubber construction is suitable for use with chemicals. Resistant to acids, alkalis and ammonia. Easy to clean - dishwasher safe. Stable at temperatures between -20°C - 70°C. Stoppers are designed for use in professional laboratories, but are perfect for a variety of applications in the home and garage.