Specification Brand : Super Tool BulletPoint1 : For counterboring and spotfacing in applications where machine requires a smaller shank BulletPoint2 : 1/64" Corner Radius, Tool Diameter Tolerance: +.001"/-0". Shank Diameter Tolerance: +0"/-.001" BulletPoint3 : Pilot Hole Diameter:1/4, If using a pilot this is the shank diameter of the pilot you should choose BulletPoint4 : Minimum Cut Diameter: .281" 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) ExternallyAssignedProductIdentifier1 : 650361806324 ExternallyAssignedProductIdentifier2 : 0650361806324 IncludedComponents : Reduced Shank Counterbore,1-5/16" D ItemName : 1 5/16" Aircraft Counterbore, Carbide Tipped, (Reduced Shank Counterbore), 3/8" Shank Diameter, 3 Flutes, 2 3/4" OAL, (1.3125" Diameter, 1-5/16), 52242, USA Made ItemPackageDimensions_Height : 11.7 centimeters ItemPackageDimensions_Length : 4.1 centimeters ItemPackageDimensions_Width : 4.3 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : counterbores Manufacturer : Super Tool Material : Carbide ModelNumber : 52242 NumberOfItems : 1 PackageLevel : unit PartNumber : 52242 ProductSiteLaunchDate : 2014-11-14T17:10:50.980Z Size : One Size Style : Built-In Pilot SupplierDeclaredDgHzRegulation : not_applicable UnitCount : 1 UnspscCode : 27111700