This construction protractors consists of a protractor arm and Alloy Steel Semicircle head protractor, the swing arm can be locked with the protractor head to use. they also can be separated to use
Adjustable Protractor Arm
It's a aluminum steel ruler, 8''/12" adjustable arm for setting the bevel, transferring angles, and finding your measurement.
This square head protractor has a 0 to 180-degree semi-circle scale in forward and reverses directions to measure all angles on the job. This protractor head also has a magnetic on the head back, it can adsorption the ruler.
6-in-1 Multifunctional Protractor
This protractor can be used to quickly measure angles and draw lines, make 45 degrees and 90 degrees equal parts, make depth and height measurements, quickly draw circles as well as circle center measurements without the need to use multiple tools for tedious measurements.
The angle protractor ruler is suitable for engineering, angle measurement, student drawing, architectural design, carpentry, length measurement, ideal gift for students, craftsmen, architects and designers