EASY DRILLING: Two-fluted design provides faster, smoother cutting; Provided with small pressure and the sets can cut through wood, sheet metal, steel and other surfaces Tri-flatted shank of step drill fits into drill chuck of power tools securely and avoids slide high speed steel with high capability and durability in drilling holes in plastic, aluminum, copper, stainless steel and many other types of sheet metal step drill bit with 10 step sizes: 1/4 inch, 3/8 inch, 1/2 inch, 5/8 inch, 3/4 inch, 7/8 inch, 1 inch, 1-1/8 inch, 1-1/4 inch, 1-3/8 inch Mainly used for drilling thin steel within 3mm and it can be completed a one-time processing according to the need to process different diameter holes, Weight: 0.6393405598 pounds, Manufacturer: Wesafrae