Keeney K91BN Shallow Flange for 1/2-Inch IPS, Brushed Nickel Keeney K91VB Shallow Flange for 1/2-Inch IPS this item will fit on 1/2 IPS Designer finish matches existing hardware The OD of the product is .807" The ID of the hole in the flange is .840" There are tabs inside the ID that can be bent inward to make a variance of .033" to have a pipe fit snugly inside the flange Shallow flange Brushed Nickel For 1/2-Inch Iron Pipe Metal Designer finish matches existing hardware