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:1/8, If using a pilot this is the shank diameter of the pilot you should choose BulletPoint4 : Minimum Cut Diameter: .156" 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) ItemName : 5/8" Aircraft Counterbore, Carbide Tipped, (Reduced Shank Counterbore), 1/4" Shank Diameter, 3 Flutes, 2 3/4" OAL, (.625" Diameter), 52220, USA Made ItemPackageDimensions_Height : 10.6 centimeters ItemPackageDimensions_Length : 2.1 centimeters ItemPackageDimensions_Width : 2.6 centimeters ItemPackageQuantity : 1 ItemShape : Round ItemTypeKeyword : counterbores Manufacturer : Super Tool Material : Carbide ModelNumber : 52220 NumberOfFlutes : 4 NumberOfItems : 1 PartNumber : 52220 ProductDescription : 5/8" Aircraft Counterbore, Carbide Tipped, (Reduced Shank Counterbore), 1/4" Shank Diameter, 3 Flutes, 2 3/4" OAL, (.625" Diameter), 52220, USA Made ProductSiteLaunchDate : 2014-11-14T17:11:26.920Z SupplierDeclaredDgHzRegulation : not_applicable UnitCount : 1 UnspscCode : 27111700