Westcott 8” Adjustable Triangle Scale inner graduations on arc give degrees of one angle while the outer row of figures gives the degrees of the complimentary angle. It features a translucent color to allow for viewing through to the page. Westcott Drafting & Drawing Tools are some of the finest products of their kind for students and professionals. Our commitment to meticulous quality and cutting edge innovation in measurement and art materials has earned an unparalleled reputation.