These are small custom aluminum flange adapters flat square to 3 inch round with 4 mounting screws, well built, and new parts. could be used for automotive, hvac, cabinet vent, or whatever?
Drillco 2000E Series 3 Piece Series High Speed Steel Hand Threading Tap Set, Uncoated (Bright) Finish, Round with Square End Shank, 1/4"-20 UNC Thread (Pack of 1) Product Details Shipping Weight: 1.6 ounces Shipping: Currently, item can be shipped only within the U.S.
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