Specification Brand : Super Tool BulletPoint1 : For Counterboring most materials BulletPoint2 : Tool diameter tolerance: +.001"/-0". Shank Diameter Tolerance: +0"/-.0005" BulletPoint3 : Pilot Hole Diameter:3/32, If using a pilot this is the shank diameter of the pilot you should choose BulletPoint4 : Minimum Cut Diameter: .114" 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 : 1/4" Counterbore, Carbide Tipped, 3 Flutes, 15/64" Shank Diameter, Straight Shank, 3 13/16" OAL, USA Made, (.25" Diameter), 56401 ItemPackageDimensions_Height : 4 inches ItemPackageDimensions_Length : 8 inches ItemPackageDimensions_Width : 4 inches ItemPackageQuantity : 1 ItemTypeKeyword : counterbores Manufacturer : Super Tool Material : Carbide MfgSeriesNumber : 902 ModelNumber : 56401 NumberOfItems : 1 PartNumber : 56401 ProductDescription : 1/4" Counterbore, Carbide Tipped, 3 Flutes, 15/64" Shank Diameter, Straight Shank, 3 13/16" OAL, USA Made, (.25" Diameter), 56401 ProductSiteLaunchDate : 2014-11-14T17:09:17.613Z Size : 5 inches SupplierDeclaredDgHzRegulation : not_applicable SurfaceRecommendation : Cast Iron UnitCount : 1 UnspscCode : 27110000