The shanks on these step drill bits have three flats that help prevent the bits from slipping in the drill chuck during drilling. These cone-shaped bits have steps of increasing diameter marked along their cutting head. As each bit is pushed into a piece of sheet metal or other thin material, each step on the bit widens the hole. The bits also have a self-starting split point that prevents the bits from moving, or walking, when starting to drill, which eliminates the need for using a center drill to create a starter hole before drilling.
Name : IRWIN 10234CB 3/16in - 7/8in Unibit Cobalt Alloy Steel Step Drill, 12 Steps , IRWIN TOOLS
Category : Drill Bits
UPC Code : 038548099224
Country of Origin : United States. Country of origin is subject to change.
ADI Part Number : IW-10234CB
Brand Name : IRWIN
Manufacturer : IRWIN Industrial Tool Company
Manufacturer Part Number : 10234CB
Product Model : 10234CB
Product Name : 10234CB Drill Bit
Product Type : Drill Bit
Material : Cobalt
Application/Usage : Concrete, Stone
Drill Bit Type : Step Bit
Additional Information : <ul><li>Hole Sizes: 3/16" - 7/8"</li><li>Number of Holes: 12 steps</li><li>Increments: 1/16"</li><li>Radial concave flute</li></ul>