Great For Preparing Threads After Cutting By Removing Burrs And Damaged Threads.Quickly Repairs Damaged Threads From 5/16-in To 7/8-in (8-22mm)Hardened HRC 60 Steel Blades Remove Burrs And Uneven Ridges From Threaded Rods, Pipes, And MoreWorks On Hardened And Mild Steels, Grade 8 Fasteners, Stainless Steel, Brass, Copper, Aluminum, Plastics, Wood, Etc.1/4-Inch Hex Shank Attaches To Your Drill Quickly