10231 UniBit Step Drill Bit, 1/8 To 1/2 In., High Speed Steel

The Irwin 10231 UniBit #1 Step Drill Bit is a versatile specialty drill designed to drill multiple hole sizes without changing bits. This high-speed steel step drill delivers 13 hole sizes ranging from 1/8 inch to 1/2 inch in 1/32-inch increments, making it ideal for applications where you need various sized round holes in thin materials. The single-flute cutting edge design ensures true round holes with greater control through each step, while the patented SpeedPoint tip penetrates faster and prevents the bit from walking when starting holes.

This step drill excels at drilling into thin materials including stainless steel, copper, brass, aluminum, plastic, and laminates. The hex shank (3-flattted design) prevents slipping in the drill chuck, and hole sizes are etched directly in the flute for quick identification. Each step size acts as a pilot for the next, eliminating the need to change drills repeatedly and saving time on projects requiring multiple hole sizes.

Features and Benefits

• SpeedPoint Technology: The advanced tip penetrates faster than previous Unibit models and prevents walking, ensuring accurate hole starts in tough materials.
• 13 Hole Sizes in One Bit: Delivers sizes from 1/8 inch to 1/2 inch in fine 1/32-inch increments, eliminating multiple bit changes.
• Single-Flute Cutting Edge: Provides superior control through each step and produces true round holes every time.
• High-Speed Steel Construction: Built to handle stainless steel, copper, brass, aluminum, plastic, and laminate materials.
• Hex Shank Design: The 3-flattted hex shank prevents slipping in drill chucks, ensuring secure operation.
• Size Identification: Drill diameters are etched directly in the flute for easy size reference without guessing.

Specifications

• Brand: Irwin
• Model: 10231
• Drill Size Range: 1/8 inch to 1/2 inch diameter
• Number of Sizes: 13 hole sizes in 1/32-inch increments
• Material: High-speed steel
• Shank Size: 1/4 inch hex shank
• Cutting Style: 1-flute
• Maximum Material Thickness: 1/8 inch
• Color: Silver metallic
• Weight: 0.09 lb
• Dimensions: 6 x 2.874 x 0.748 inches