[29MM (5-29MM) High Speed Steel]

[#1 (1  & 8-1  & 2  ) Cobalt]

[#10 (1  & 2  ) High Speed Steel]

[#1M (4-12MM) High Speed Steel]

[#3 (1  & 4-3  & 4  ) High Speed Steel]

[#3M (6-18MM) High Speed Steel]

[#4 (3  & 16-7  & 8  ) Titanium Nitride (TiN)]

[#3 (1  & 4-3  & 4  ) Cobalt]

[#12 (3  & 8  ) High Speed Steel]

[#4 (3  & 16-7  & 8  ) Cobalt]

[#4 (3  & 16-7  & 8  ) High Speed Steel]

[#5 (1  & 4-1-3  & 8  ) High Speed Steel]

[#2 (3  & 16-1  & 2  ) Cobalt]

[#20 (9  & 16-1  ) Cobalt]

[#2 (3  & 16-1  & 2  ) High Speed Steel]

[#9 (7  & 8   + 1-1  & 8  ) Cobalt]

[PG29M (5-28.3MM) High Speed Steel]

[#1 (1  & 8-1  & 2  ) Titanium Nitride (TiN)]

[#1M (4-12MM) Titanium Nitride (TiN)]

[#13 (1-1  & 8  ) High Speed Steel]

Product Description

IRWIN Tools 10234CB Unibit Cobalt Alloy Steel Sheet Metal Step Drill Bit offers 12 different hole sizes in one single bit, from 3/16" to 7/8" in increments of 1/16". Ideal for drilling true, round holes with a smooth, clean finish in a variety of materials like stainless steel, sheet metal, aluminum, fiberglass, plastics, plexiglass, and wood. The Cobalt Alloy Steel high speed steel construction provides increased life of the cutting edge which makes it ideal for tough applications like stainless steel drilling. The SpeedPoint tip penetrates fast and doesnt require a pilot/starting hole. The 3/8" hex shank provides secure grip in the drill chuck. Permanent laser-etched sizes inside flute are easy to read for precise control during the hole enlarging process. Product made in USA.

From the Manufacturer

Irwin Unibit Cobalt is made of high speed steel, this step drill bit will last longer in the toughest of materials. Irwin Industrial Tools 10234CB 4 12 Hole Sizes (3/16-Inch-7/8-Inch), 1/16-Inch Increments