Unibit Self-Starting Step Drills

• 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 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