Size: 3Nominal Diameter Small End: .1813"Nominal Diameter Large End: .2294"Nominal Overall Length: 3-11/16"Nominal Flute Length: 2-5/16"Has A Square Shank For Use By Hand In Tap And Reamer WrenchesDesigned To Ream And Deburr Holes By Hand Into Which Standard Taper Pins Will Fit