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The Stainless Steel Protractor from MASS PRO Level is an essential tool for machinists, carpenters and woodworking hobbyists. Its stainless steel construction gives it strength, durability and the ability to resist rust. This MASS PRO Level 6 in. stainless steel protractor has the length for setting up bevels or for measuring parts in the construction of machinery. The square head makes it possible to anchor the protractor against objects to hold it in place as you take measurements. This Empire Level square head protractor has a 0 to 180 semi-circle scale to measure all angles. Measure an angle with the small stainless steel arm which glides smoothly for precise alignment. Use the black-knurled thumb nut to lock the arm into place as you take measurements. 6 in. stainless steel arm, square head 0 to 180 measurements Use to measure and transfer angles Lightweight design Brass center screw will not rust or corrode Ideal for metalworking