Made of flexible, durable 0.03" transparent green plastic with a matte finish on one side to reduce glare, this template features 27 ellipses from 1/8" to 2" in projections of 35 with the isometric diameters measured through the 30 diagonal. It includes fractional and decimal inch markings plus metric equivalents, centering lines for precision placement and built-in ink risers for smear-free drawing in pen or pencil. The allowance on all openings is designed for use with .5mm pencil lead or pen point.