Koala Tools Geometric Transparency Grids

Features four gridded transparencies to aid in drawing projects: quadrille, 1/4″ isometric, golden ratio and circular (polar coordinates). Quadrille is marked in 1/2″ increments with a solid line and 1/4″ increments with a dotted line. Designed for use with lightboxes or overhead projectors. Made of 0.3mm PVC film, each transparency measures 8-1/2 x 11″.