Glass channel: 1.AL 6063. 2.Surface: Satinless steel look, Matt silver, Raw, no anodized 3.For 21.52 -25.52mm glass Glass channel:1, Avaliable for wall and floor installations2, Multiple selection of the surface treatment3. Quick & Easy Installation 4.Fresh new look in the office & home 5.Have more economical choice 'Steady 'Aluminum Glass Channel-Top 21.52-25.52mm