Alvin - WorkMaster Junior Base - Black - The Alvin WorkMaster Junior Table Base is a sturdy base constructed of 1 inch x 1 inch heavy-gauge steel tubing. Height adjusts from 29 inches to 44 inches in the horizontal position. Base available in black or white. 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.