12 Sizes Step Drill Bit, 1/4 to 2-3/8 inch Black High Speed Steel Drill Cone Bits for Sheet Metal Hole Drilling Cutting, Sprial Unibit Extra Large 2-3/8 inch 1pc M2 Larger Bit (Black)

HSS Titanium Coating - High speed steel along with titanium coating ensures outstanding durability and sharpness, can reduces the friction, runs cooler.
Meet Your Demands - With the step drill bits we offered, you can process different kinds of diameter holes, which greatly saves you a lot of trouble.Great for steel sheets/ aluminum sheets/ copper/ plastic/ wood board and many other types of sheet metal with ease countersunk. Suitable for Home DIY, and General Building/ Engineering Use.
A Must - Have for Handyman or Professionals - Perfect for home repairs and light jobs such as drilling holes in plastic, aluminum, copper, iron and many other types of sheet metal (excluding steel or any other harder metal).
Engraved Sizes - Easily identify which size you need with the contrasted, laser engraved sizes inside the step drill bit flute.
Quick Chip Removal - Double flutes design allows the particles escape easily for a clean drilling operation.