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:7/16, If using a pilot this is the shank diameter of the pilot you should choose BulletPoint4 : Minimum Cut Diameter: .489" 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 5/8" Counterbore, Carbide Tipped, 4 Flutes, 1 1/4" Shank Diameter, Straight Shank, 8 1/8" OAL, USA Made, (1.625" Diameter, 1-5/8), 56423 ItemPackageQuantity : 1 ItemTypeKeyword : counterbores Manufacturer : Super Tool Material : Carbide ModelNumber : 56423 NumberOfItems : 1 PartNumber : 56423 ProductDescription : 1 5/8" Counterbore, Carbide Tipped, 4 Flutes, 1 1/4" Shank Diameter, Straight Shank, 8 1/8" OAL, USA Made, (1.625" Diameter, 1-5/8), 56423 ProductSiteLaunchDate : 2014-11-14T17:11:19.307Z SupplierDeclaredDgHzRegulation : not_applicable UnitCount : 1 UnspscCode : 27111701