What is this?Round silicone plugs is suitable for Instrument and meter,aviation industry,transportation, radio motors,make up appliances, furniture manufacture and waterproof plugs, sealing plugs, test tube plugs, rubber bulkheads, caps, cylinder plug heads, threaded rubber plugs,etc.What will I get?Snap in Type Locking Hole Plugs,Material:Silicone;Color:White;Outer Diameter:22.5mm/0.89 Inch;Height:13mm/0.51 Inch;Mount hole diameter:18mm/0.7 Inch;6pcs x Hole Plugs;Is there any advantages of the product?It is made of silicon material,High elasticity, good insulation and sealing performance, compression resistance, shock absorption, anti-slip, wear resistance ,high temperature resistance ,acid and alkali resistance, will not dissolve and swell in acidic liquids;How to use it?Fingertip pressure snap-locks into its mounting hole.What should I notice?Due to manual measurement, the size may have an error of +/- 1-2mm. And a slight deviation in color due to different batches.