Contains 10 each of the following sizes: 3/8″ x 5/8″, 1/2″ x 3/4″, 5/8″ x 1″, 3/4″ x 1-1/8″, and 1″ x 1-1/2″ in each of the following thicknesses: 0.020″, 0.031″, and 0.125″. Made of high quality, low carbon, cold rolled, full hard, steel shim. Saves time over re-machining. Precision thicknesses for more accurate results. Plastic compartment box is easy to store. Precision brand arbor shims are used for fast, accurate spacing of milling cutters, gang cutters, saws, slitting blades, and grinding tools. Assortment kit contains the most commonly used arbor shims.