Size: 5/16" - 9/16"5-Step Reamer (5/16", 3/8", 7/16", 1/2" & 9/16")Enlarge, Align And Drill Holes In Steel, Stainless Steel And Tough Alloys90 Degree Drill Point1/2" Flatted ShankFor Use In Portable Power Drills Or In A Drill PressCut Burr Free Holes In Material Up To 1/2" ThickSharp 2-Flute Design For Fast, Stable Cutting