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Extra-Heavy-Duty Shower Curtain Rod with flanges is fabricated of alloy 18-8 stainless steel, type 304. Tubing is 18 gauge, 1-1/4"O.D. with a satin finish and are protected during shipment with a plastic bag. Length shall be as specified. Flanges shall be fabricated of 20ga. stainless steel with a satin finish. Flanges has (3) countersunk 13/64" (5.2mm) diameter holes to accept #10 flat or oval head screws furnished by others.