IRWIN Unibit Self-Starting Step Drill #10231, HSS, 13 Hole Sizes, 1/8 to 1/2″ Hole Dia.

High Speed Steel, Standard Point Step Drill Bit
1/8″ Step Length, 1/4″ Hex Shank, Bright Finish

Features:

• Multiple Hole Sizes UNIBIT Step Drills have an exclusive single radial concave flute.
• Allows the drilling of perfectly round holes in thin materials quickly and with less effort.
• Each bit is constructed of industrial grade high speed molybdenum steel, and is heat treated to a hardness of between 61 and 63 on the Rockwell “C” scale. This assures maximum strength and long life.
• Use for steel, copper, brass, aluminum and other thin materials.
• Also ideal for drilling through wood, composition board, and even plexiglass and plastics which often crack with standard twist drills.
• Handle thicker materials by drilling from both sides of work surface.
• Use for reaming, deburring and cutting through soft wood or plasterboard.

Specifications:

Manufacturer Part # 10231 Minimum Hole Diameter (Inch) 1/8 Maximum Hole Diameter (Inch) 1/2 Drill Bit Material High Speed Steel Drill Bit Finish/Coating Bright Number of Hole Sizes 13 Shank Type Hex Shank Diameter (Inch) 1/4 Step Length (Inch) 1/8 Hole Diameter (Inch) 1/8 to 1/2 Point Type Standard Step Increments (Inch) 1/32 Drill Bit Grade General Purpose

See all IRWIN Unibit Self-Starting Step Drills