Drill America 1/4-3/4 by 1/16 Increments HSS Step Drill
 
Uncoated (bright) finish
Single bit can be used for drilling a wide range of hole sizes in metal, plastic and wood
Single radial concave flute crates perfectly round holes in metal, plastic wood and other thin materials without center punching
Constructed of industrial grade high-speed molybdenum steel, heat-treated and temperature for long life
No center punching needed