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 alloy construction for durability.Portable: lightweight and easy to in your work pouch or pocket.perfectfor all building 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-inchMultiple 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 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.