These are a multipurpose clip that we use to attach our water level indicator tubing that is 5/8 inch outside diameter. It is also very useful for other hydroponic tubing applications that use 1/2 inch ID tubing. You will need to drill a 1/4 inch hole to install these onto your system. This is a pack of 10 with Free shipping. -Gary
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Clips
They hold my hose in place what more could you ask fer.
