Irwin tools 10502zr Unibit® sheet metal step drill bit set is a selection of the most popular Unibit® step drill bits in the low diameter range (below 7/8").
Ideal for drilling true round holes with precise control in a variety of materials like sheet metal, metal plates, aluminum, fiberglass, plastics, plexiglass, and wood.
The specially designed cutting edge drills true, round holes for a smooth, clean finish, and the speedpoint tip penetrates fast, prevents "walking," and eliminates the need for a pilot/starting hole.
The hex shank provdes a secure grip in the drill chuck.
Plus, the permanent laser-etched sizes inside the flute are easy to read for precise control during the hole enlarging process.
Contains: Unibit® #1 with 13 hole sizes (1/8" to 1/2" by 32nds), Unibit® #2 with 6 hole sizes (3/16" to 1/2" by 16ths for deeper steps), and Unibit® #3 with 9 hole sizes (1/4" to 3/4" by 16ths).