6" Tempered Stainless Steel Blade – Knurled thumb lock nut secures any angle quickly and firmly. Double 0–180° Graduations on Same Side – Read any angle and its supplement instantly without flipping the tool. Flat-Back Rectangular Head with Four Working Edges – Sits rock-solid on any surface for repeatable results. This PEC Angle Protractor delivers everything machinists and fabricators demand from a top-tier rectangular-head protractor: crisp double graduations (0–180° both directions on the same side), deep-etched markings with radial lines, tempered stainless steel construction, and a large knurled lock nut—yet it costs dramatically less than other premium American-made models. Built entirely in the USA to the highest standards, this is the protractor serious shops choose when they want lifetime durability and dead-on accuracy without the inflated price tag. Add the PEC Angle Protractor to your toolbox today and get genuine USA-made precision ANGLE FINDER MEASURING TOOL.