Alvin - Opal Table Base - Black - The Opal Table Base by Alvin is extremely versatile. The Opal Table features a unique oval and round tubular base design for stability. The Opal Table Base is 1.25 inches diameter steel tubing. Distance between legs is 28.75 inches. Unique double-bend back legs. Base available in white or black powder coat finish. Alvin is one of the primary sources for drafting supplies and drawing equipment in the country. Creative Coldsnow is a pround retailer of Alvin graphic arts, drafting and fine arts products.