Irwin Hanson 10502ZR Unibit HSS Step Drill Bit Set 3-Piece 1/8" to 3/4"

The Irwin Unibit 10502ZR is a 3-piece high-speed steel (HSS) step drill bit set covering the most popular fractional hole sizes in a single compact kit. Containing Unibit #1, #2, and #3, this set delivers a total of 28 hole sizes ranging from 1/8" to 3/4", making it the ideal solution for drilling true, round holes in sheet metal, aluminum, fiberglass, plastics, plexiglass, and wood without needing to swap bits.

What's Included:

• Unibit #1 — 13 hole sizes from 1/8" to 1/2" in 1/32" increments (1/4" shank)
• Unibit #2 — 6 hole sizes from 3/16" to 1/2" in 1/16" increments, ideal for materials up to 3/8" thick
• Unibit #3 — 9 hole sizes from 1/4" to 3/4" in 1/16" increments

Key Features:

• Single-flute cutting edge provides greater control through each step for clean, accurate holes
• 3-flatted hex shank locks securely in the drill chuck to prevent slipping and reduce vibration
• Non-skid self-starting SpeedPoint tip penetrates fast, prevents walking, and eliminates the need for center punching or pilot holes
• Laser-etched size markings are permanently engraved inside the flute for easy reading during the drilling process
• Constructed from high-speed steel (HSS) for durability and long-lasting performance under heavy use
• Automatically deburrs the top side of the hole as it drills
• Backed by a full lifetime warranty

The Irwin 10502ZR Unibit set eliminates the need to carry multiple individual drill bits for common hole sizes. Whether used for electrical, HVAC, sheet metal fabrication, or general workshop applications, these step drill bits deliver fast, precise results in a wide range of thin materials.