Irwin Unibit Step Drill Bit 7/8 in. (Model 10239)

Engineered for precision and durability, the Irwin Unibit Step Drill Bit 7/8 in. delivers smooth, controlled drilling through a variety of thin materials. Its single-flute cutting edge minimizes chatter and ensures consistent chip removal, while the sharp SpeedPoint tip penetrates quickly and prevents walking for pinpoint accuracy. The convenient hex shank locks securely in standard chucks, making bit changes fast and reliable. Ideal for professionals and DIYers alike, this step bit drills two clean hole sizes—7/8 in. and 1-1/8 in.—without the need for multiple bits.

Whether you’re working on stainless steel panels, copper tubing, plastic sheeting or aluminum housings, this high-speed steel bit cuts effortlessly and resists wear. Its brushed finish reduces friction and heat buildup, extending bit life and keeping projects on schedule.

Key Features

• Single-flute cutting edge for superior control and chip evacuation
• SpeedPoint tip for quick starts and reduced walking
• Hex shank for slip-resistant grip in drill chucks
• Drills two hole sizes: 7/8 in. and 1-1/8 in.
• Suitable for stainless steel, aluminum, brass, copper, plastic and laminates

⚠️ WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.