1/2" Inside Dimension. The holesaw size is 5/8" . These grommets can be used to replace old, worn top hat grommets in your hydroponic system and can be a valuable solution when building your own garden system. Top Hat grommets have a straight side wall for easy installation. When the fitting is inserted into the grommet, the wall is pushed against the whole surface to create the seal.
Item Number: 139202
Universal Product Code: 847127008300
Manufacturer: Sunlight Supply
Manufacturer's Part Number: 747066
Brand: Hydro Flow