¡ï Specification: 1/2"(13mm) Drill Hole, 3/8"(10mm) ID Top Hat Grommets, with 0.67"(17mm) Outer diameter, Groove 0.2"(5mm), and 2mm(0.08") Upper Thickness, Total 10pcs of Silicone Rubber Grommets for 3/8"(10mm) Outer Diameters of Wires, Cables, Vinyl or Rubber Tubing;, ¡ïFunction£ºThese Silicone wire grommets can be used to replace old, worn grommets in your hydroponic systems, can be a valuable solution when building your own garden system, and are essential components when making a system from scratch. ¡ïHigh Quality: EASYEAHS Top Hat Grommet are Wear Resistant, -40¡ãc ~ +250¡ãc High And Low Temperature Resistant, Chemical oil resistant, Insulation; Acid and Alkaline resistant; Aging and UV resistant, Waterproof; and creates a air/water tight seal for fittings and airlines. ¡ïEasy Installation: Top Hat grommets have a straight side wall for easy installation. When the tubes or fitting is inserted into the grommet, the wall is pushed against the whole surface to create the seal. ¡ïWide Applications: Protects Cables Wires form Scratch or Seals Hydroponics Drip System, Tubing Bucket System, Home gardens, Landscaping and commercially installed irrigation systems.