NEIKO 10172A Step Drill Bits with 4-Flute Spiral-Grooved Design Step Bit &1/4-Inch Hex Shanks, Step Drill Bit Set for Metal, Quick-Change Step Up Drill Bit for Metal, Unibit Step Drill Bit Metal

DURABLE DRILL BITS: These step drill bits are made with #4241 high-speed steel and have titanium-nitride coatings for extra durability. The 4-flute spiral-groove design makes these fast and long-lasting metal-cutting tools. REVOLUTIONARY DESIGN: With a 1/4-inch quick-change hex shank, each unibit step drill bit fits securely in most pistol drills or drill presses. Use these cone-shaped, versatile, and small drill bits for metal projects at work or home. DRILL BITS FOR HARDENED STEEL: Use this step up drill bit set for metal and steel to create the exact hole size you need. The fluted spiral drill-bit design automatically deburrs and expands holes for a cleaner drilling process every time. 4 FLUTE DESIGN: These 9 stepper drill bits come in various sizes to work for any job. The 11- step bit for metal are built in 1/32-inch increments ranging from 3/16" to 1/2", and the 9-step bits come in 1/16-inch increments ranging from 1/4" to 3/4". HEAVY-DUTY DRILL BITS: Our cone drill bit is created to work with any project, large or small. This multifunction stepped drill bit is designed with you in mind, so you can get your work done with confidence and speed using our quality tools!