Harvey Tool 946009 | 0.2450" Diameter x 0.0720" LOC x 1/4" Shank x 2-1/2" OAL 4FL Uncoated Carbide Thread Relief CutterFeatures Tool designed to relieve stress concentrations at corners of undercut and bottom of last thread to prevent fracture and failure Chamfer eliminates burrs and partial threads at last thread Flattens bottom of hole to achieve maximum thread depth 4 flutes Center cutting Solid carbide CNC ground in the USA Product Specifications Mill Diameter (Decimal Inch) 0. 2450" Neck Diameter (Decimal Inch) 0. 1550" Length of Cut (Decimal Inch) 0. 0720" Neck