KKmoon 5pcs Step Drill Spiral Groove Triangular Shank Stepped Drill Set Multi Diameter Drill Bits for Sheet Metal Steel Hole Drilling Cutting

Features:
Set of 5pcs Drills: 1/4-1-3/8, 3/16-7/18, 1/4-3/4, 1/8-1/12, 3/16-1/2, step drills with 5 sizes to meet your different drilling demands.
High Speed Steel Material: features of high quality, high hardness, and good durability, which really an essential hardware tool for drilling, cutting, and woodworking using.
Surface Blue Coating: step drill bits has the advantages of good abrasion resistance, good heat resistance, and rust resistant.
Professional: spiral groove can make a precise, smooth, clean and perfectly round hole.
Applications: suitable for punch holes through sheet metal, steel plate, aluminum plate, brass or wood.