Specification Brand : Super Tool BulletPoint1 : For Counterboring most materials BulletPoint2 : Tool diameter tolerance: +.001"/-0". Shank Diameter Tolerance: +0"/-.0005" BulletPoint3 : Pilot Hole Diameter:3/16, If using a pilot this is the shank diameter of the pilot you should choose BulletPoint4 : Minimum Cut Diameter: .228" Because there is a pilot hole the tool will not cut below this diameter. BulletPoint5 : Set screw to hold a pilot or drill bit in place (if you are using a pilot or drill bit) FinishType : Uncoated ItemName : 1/2" Counterbore, Carbide Tipped, 3 Flutes, 7/16" Shank Diameter, Straight Shank, 4 5/16" OAL, USA Made, (.5" Diameter), 59805 ItemPackageDimensions_Height : 11.9 centimeters ItemPackageDimensions_Length : 1.8 centimeters ItemPackageDimensions_Width : 2.1 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : counterbores Manufacturer : Super Tool Material : Carbide Material1 : Carbide Material2 : Alloy Steel MfgSeriesNumber : 903 ModelNumber : 59805 NumberOfItems : 1 PartNumber : 59805 ProductDescription : 1/2" Counterbore, Carbide Tipped, 3 Flutes, 7/16" Shank Diameter, Straight Shank, 4 5/16" OAL, USA Made, (.5" Diameter), 59805 ProductSiteLaunchDate : 2014-11-14T17:07:26.607Z Size : 1/2 inches StreetDate : 2017-03-12T00:00:01Z SupplierDeclaredDgHzRegulation : not_applicable UnitCount : 1 UnspscCode : 27111701