For Counterboring most materials Tool diameter tolerance: +.001"/-0". Shank Diameter Tolerance: +0"/-.0005" Pilot Hole Diameter:3/16, If using a pilot this is the shank diameter of the pilot you should choose Minimum Cut Diameter: .228" Because there is a pilot hole the tool will not cut below this diameter. Set screw to hold a pilot or drill bit in place (if you are using a pilot or drill bit)
9/16" Counterbore, Carbide Tipped, 3 Flutes, 1/2" Shank Diameter, Straight Shank, 4 5/16" OAL, USA Made, (.5625" Diameter), 59806