FOUR Ea. Long Lasting Production Quality 1/8" Diameter Shaft/Shank, Cone Shaped Head Burr/Cutter.

The Head is about a 0.240 Diameter tapered down to about a 0.195 Diameter.
{About 1/4" down to 3/16" Head with a 1/8" The shaft is 1-5/8" long.}

NOS, New Old Stock.
  
Tungsten Carbide Cutter.