... 48mmDetailed Product Description:Sunshade umbrella:Structure: Cloth + alum-frame or wooden frame + base; Cloth: waterproof, UV resistant, high ... density, colorfast; Frame: shaft + ribs ( aluminium fame or wooden frame) Diameter of round shaft: φ38, φ48, φ ... 8 ribs, 10 ribs;4. Base: round base or square base; Granit base, marble base, cement base, ... year. outdoor sun umbrella,personal sun umbrellas