Our aluminum straightedges are 1-3/4" wide and 7/16" thick, and will not rust. The reference edge is machined flat to within 0.003" over the entire length. They are available in three lengths, 24", 38" and 50". The 24" straightedge weighs 1 lb, the 38" weighs just under 2 lb, and the 50" version weighs 2.5 lb.
Made in Canada.