HFS (Tm) Router Bit Set With Wood Case - 1/4" Shank - Heat Treated (12 Pc Set) Router bit sets offer carbide bits with a variety of popular cutting profiles. Fully heat-treated shanks and bodies for durability - 1/4" Shank Controlled depth of cut minimizes kickback Precision ground solid carbide cutting edges and smooth running bearings Solid wood cases lined with felt with tilting storage compartments that protect and organize