Contains 1 of each thickness: 0.001", 0.002", 0.003", 0.004", 0.005", 0.006", 0.007", 0.008", 0.010", 0.012", 0.015", 0.020", 0.025", 0.031", 0.048", 0.062", 0.090", and 0.125". Made from corrosion resistant, 300 Series Stainless Steel. Arbor shims have no keyways. Saves time over re-machining. Precision thicknesses for more accurate results. Packaged in airtight poly bag. Precision Brand Arbor Shims are used for fast, accurate spacing of milling cutters, gang cutters, saws, slitting blades, and grinding tools.