Specification Brand : Super Tool BulletPoint1 : For Counterboring most materials, 4 Flutes (different than picture) BulletPoint2 : Tool diameter tolerance: +.001"/-0". Shank Diameter Tolerance: +0"/-.0005" BulletPoint3 : Pilot Hole Diameter:3/8, If using a pilot this is the shank diameter of the pilot you should choose BulletPoint4 : Minimum Cut Diameter: .426" 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 : 1 7/16" Counterbore, Carbide Tipped, 4 Flutes, 1 1/4" Shank Diameter, Straight Shank, 7 7/8" OAL, USA Made, (1.4375" Diameter, 1-7/16), 56420 ItemPackageDimensions_Height : 20.3 centimeters ItemPackageDimensions_Length : 7 centimeters ItemPackageDimensions_Width : 14 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : counterbores Manufacturer : Super Tool Material : Carbide ModelNumber : 56420 NumberOfItems : 1 PartNumber : 56420 ProductDescription : 1 7/16" Counterbore, Carbide Tipped, 4 Flutes, 1 1/4" Shank Diameter, Straight Shank, 7 7/8" OAL, USA Made, (1.4375" Diameter, 1-7/16), 56420 ProductSiteLaunchDate : 2014-11-14T17:11:37.946Z SupplierDeclaredDgHzRegulation : not_applicable UnitCount : 1 UnspscCode : 27110000