<a data-hook="product-link-linked" class="a-link-normal" href="/Freud-SS100-Dado-Shim-Set/dp/B0000223O7/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Freud SS100 Dado Shim Set</a>This product does what it says it does. Is it really necessary? Probably not. In order to size a dado precisely, you measure to approximate the set of dado blades used to the desired width. Then you start cutting test grooves in scrap stock and adding or change shim thicknesses and cutting another test. Depending on your skill and luck, you may get it right in several tries.