1. Foldable ruler bar: 6-inch fold-out extension arm for 6inch or 12inch layout needs, increase measuring distance after opening, reduce storage space after folding.convenient to carry.2. Stainless steel needle drawing tool: the tail is screwed and fixed on the ruler body easy to carry.3. Adjustable positioning tool: when in use, it can adjust to the required angel, tighten the nut positioning, press the middle adjustable lever to achieve precise positioning.4. Material: solid aluminum construction for durability. Portable: lightweight and easy to in your work pouch or pocket.perfect for all and remodeling projects, hobbyists, home builders, manufacturers, artists and more. Can be used to make precise right-angles and as a cutting & drawing guide.7-inch Multiple graduation rafter square has many kinds of Application, suitable for marking square and 45-Degree Lines, protractor, framing square, triangle square, marking horizontal base, and can also be used as a scriber and saw blade guide . The lip can be used for safe positioning. With 0-90 protractor scaleColour:BlackMaterial:MetalPackage Contents:1 x RulerOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.