Vise Grip Unibit Step Drill Bit - 1; 1/8 Inch To 1/2 Inch With Titanium Nitride Coating

The Unibit step drill bit features as single radial concave flute design for smooth, even cutting and virtually round holes. Ideal for drilling holes in steel, copper, brass, aluminum and other thin materials. Drills 13 holes: 1/8 inch to 1/2 inch in 1/8 inch steps 1/4 inch shank Self-starting Hardened industrial grade high speed steel with super tough Titanium Nitride coating.