PRODUCT APPLICATIONSSilicone plugs are suitable for a variety of applications such as waterproof plugs, sealing plugs, test tube plugs, rubber bulkheads, caps, cylinder plug heads, and threaded rubber plugs.PRODUCT DETAILS & INCLUDE√ Name: Silicone Plugs√ Material: Silicone√ Fit Hole Diameter: 2.5-3 mm/ 0.20-0.22 Inch√ Inner Diameter: 4.4 mm/ 0.17 Inch√ Upper Diameter: 9.8 mm/ 0.39 Inch√ Package Content: 25 Pcs x Silicone PlugsPRODUCT ADVANTAGES1. Made from silicone, these hole plugs offer not only reliable sealing but also buffering and shock absorption properties. silicone plugs with great high and low-temperature resistance (up to 480F to - 104F)2.