Package Included: You will receive 10 pcs hole plugs. Top Diameter: 9/16inch(13.9mm); Inner Diameter: 0.3inch(7.5mm); Slot Width: 0.09inch(2.2mm); Overall Height: 0.24inch(6.2mm). Material: Made of silicone, these hole plugs, waterproof and dustproof, exhibit heat resistance, low-temperature resistance, and durability. Seal Design: With its high resilience and snap-in design, the hole cap ensures a good seal for a wide range of applications. Multiple Use: Good for using as sealing hole plugs, waterproof plugs, test tube plugs, threaded rubber plugs, dust proof plugs hole covers, etc. Note: Due to manual measurement, please allow a deviation of 1 - 2mm.