The Vintage Craftsman insert is blank so you can custom fit the blade slot by passing your blade through it. Helps to prevent tear out made from high-density phenolic laminate with a bonded-melamine surface Includes side and end adjustment screws; pre-cut blade bottom pocket 14 3/8" X 3 3/4" X 3/32" thick Please CHECK the Length, Width and Thickness of your insert before ordering Replace your factory table saw insert with a phenolic zero clearance insert. Zero Clearance inserts help prevent kickback and tear-out on your stock pieces when feeding through a table saw blade. By raising your blade up through the insert, you eliminate gaps between the side of the insert and the blade. This provides with much better stock support than with most factory inserts that come with the saw. This also prevents smaller stock pieces from falling into the opening that exists with factory inserts. Zero clearance inserts can be used with any type of standard carbide tipped saw blade (standard or thin kerf blades) and can also be used with dado blades. It is recommended that if you need an insert to accommodate both a standard saw blade and a dado blade, that you purchase two separate zero clearance inserts. Use one for your normal cuts and one for dado cuts. Double check your measurements of opening so that you know it will fit