3Pcs Titanium Step Drill Bit Set, High Speed Steel Titanium Coated Drill Bits, 1/8" - 3/4" Total 28 Sizes for Plastic, Wood, Sheet Metal, Aluminum

Size: Bit #1 (6 steps): 3/16", 1/4", 5/16", 3/8", 7/16", 1/2"; Bit #2 (13 steps): 1/8", 5/32", 3/16", 7/32", 1/4", 9/32", 5/16", 11/32", 3/8", 13/32", 7/16", 15/32", 1/2"; Bit #3 (9 steps): 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4". 1/4" Hex Shank: Quick change 1/4" (6.35mm) hex shank, which can be easily fit into power driver, drill and press drill. Material: The step drill bits are made of high quality high speed steel which with titanium coating, durable, anti-corrosion, sharp enough to drill through wood, plastic, sheet metal. Two-Flute Design: Two-flute design makes it easier for cutting, provides smoother, accurate, faster cutting, it's really good tools for us. After-sale Service: If our cone drill bits don't meet your expectations, just feel free to let we know and we will provide you with free replacement service.