For students or designers in the field. This light-weight, 14-3/4" x 19-1/2" drawing board has a built-in, locking, parallel ruling straightedge. Made of durable white plastic, the board is solid enough to withstand compass points and continuous use and will not warp. The removable straightedge is graduated in inches and can be locked into position either vertically or horizontally. The graduated-protractor drafting head (optional, special order item KO25445) enables you to draw without triangles or protractors. Lock mechanism provides accurate drawing of perpendiculars, slanted parallels and crosshatching. It fits easily on the straightedge and is graduated in inches. Locks at all angles. Automatic settings in 15\u730 increments.