Pack of 10 stoppers made of superior quality rubber.Orange in color with one hole.The durable rubber construction is suitable for use with chemicals.Resistant to acids alkalis and ammonia. Easy to clean. 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.Bottom Diameter: 21mmTop Diameter: 24mmLength: 28mmNumber of Holes: 1Temperature Range: -20 °C - 70 °CPack of 10Please note: Extreme care must be used when inserting glass into the holes in rubber stoppers. See CLEAPSS for details.