Westcott Protractor Ruler is made with transparent plastic for easy and accurate measuring. Protractor is 180° with 45˚ and 60˚ triangle cutouts plus French curve symbol. Scales are in 16ths to the inch and centimeters. 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.