Material: Steel, Outside Diameter: 1.69 IN, Inside Diameter: 1.11 IN, Conduit Size: 1 - 3/4 IN, Standard: UL 514B, UL File Number E14817, CSA C22.2 No. 18.3, NEMA FB-1, For To Reduce A Knockout Or Sliphole In A Sheet Metal Enclosure To A Smaller Trade Size