Enlarge And Align Existing Holes Through Steel, Stainless Steel, Tough Alloys – Includes Sizes: 3/8, 1/2, 5/8, 3/4 In. – 1/2 In Flatted Shanks For Use In Power Drills And Drill Presses With 1/2 In Chuck Capacity – Left Hand Helix, Right Hand Cut Sheers Chips Away From Operator – Safety Collar Stop Prevents Over-Penetration And Enhances Operator Stability – Ideal For Maintenance Work, Steel Erection/Fabrication, Truck/Trailer Repair – Surface Treated High Speed Steel