Arbor spacers are used on metalworking or arbor milling machines. These spacers are designed with a keyway notch to fit onto various equipment, as well as remaining stabilized while keeping objects spaced. Each metal arbor can support different tensile strengths for heavy duty applications. We also have a variety of dimensions to fit with various machine arbors. Similarly, we have arbor shims that do not have notches, and we carry various sizes of shim stock to create customized arbor shim washers.