The Cornfield Wire Puck is made from high-density polyethylene and is designed to organize and protect wires entering a panel. Its outside diameter is 2.860' and its inside diameter is 1.970'.Included in the package: Cornfield Wire Puck, grommet, 2 bolts, and 2 nutsOutside diameter: 2.860 in.Inside diameter: 1.970 in.Included grommet is for a 1 5/8 in. drilled hole