Contains 1 of each thickness: 0.001″, 0.0015″, 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″, 0.047″, 0.062″, 0.093″, and 0.125″. Made of high quality, low carbon, cold rolled, full hard, steel shim. Arbor spacers are used for keyed applications. Keyway size: 3/16″ x 1/16″. Packaged in airtight poly bag. Precision Brand Arbor Spacers are used for fast, accurate spacing of milling cutters, gang cutters, saws, slitting blades, and grinding tools.