Alvin Clear Angle Adjustable Triangle,/p>
the Alvin Clear Angle Adjustable Triangle is made of heavy duty 1/8" thick acrylic plastic, with beveled edges, die-engraved graduations, and a white protractor arc. Double row of graduations on protractor arc shows complementary angle at any setting. Angles from 0° to 90°. Built-in magnifier allows exact settings.