Color coded arbor shims are made from a high quality plastic material. Amber color identifies the shim as 0.001″ thick. Color coding eliminates need for micrometer, saves time and reduces error. Non-magnetic and non-conductive to electricity. Corrosion resistant. Precision Brand® Color Coded Arbor Shims are used for light duty, fast, accurate spacing of milling cutters, gang cutters, saws, slitting blades, and grinding tools.