IRWIN Unibit Self-Starting Step Drills

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.