Alvin Adjustable Drafting Triangles, Alvin Clear-Angle Drawing Triangles

Alvin Clear-Angle triangles are made of heavy-duty, 0.125" thick acrylic plastic, with 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. Available in 4 sizes. Alvin adjustable plastic drafting triangles.