These shower and tub grab bars are fabricated from 1.25 inch diameter stainless steel tubing with a satin finish. The round snap-on flange utilizes a concealed mounting system that consists of a 14 gauge 304 series stainless steel mounting flange with two vertically-aligned mounting holes and a 22 gauge snap-on 304 series stainless steel cover. The flange is three inches in diameter.