Zac Tool 21-ST5T Titanium Step Drill 1/4 to 1-3/8 Inches 10 Step

Product Description

The ZAC TOOL 21-ST5T Titanium Step Drill is a professional-grade step drill bit designed for contractors, electricians, plumbers, and HVAC technicians who need clean, accurate holes in sheet metal, electrical panels, conduit boxes, and thin-gauge materials. This bit starts at 1/4 inches and steps up to 1-3/8 inches across 10 precisely machined steps, giving the user a wide range of hole sizes in a single tool. That means fewer bit changes, faster work, and less downtime on the job. The titanium coating on the 21-ST5T provides a harder cutting surface than standard high-speed steel bits. Titanium-coated step drills run cooler, resist wear longer, and maintain a sharper cutting edge through more uses. For trade professionals drilling through electrical enclosures, knockout plates, copper pipe flanges, or HVAC sheet metal, this durability matters. Step drills are the preferred tool for enlarging holes in thin materials without the material grabbing or deforming. Each step on the 21-ST5T is clearly defined, allowing the user to stop drilling at the exact size needed without guesswork or measuring. This makes the bit especially useful for electricians sizing conduit knockouts and HVAC techs fitting grommets, sensors, or fittings through sheet metal panels. The 1/4 inch hex shank is compatible with standard power drills and impact drivers, making this bit easy to swap in and out quickly on the job site. Whether you are working in a residential panel box, a commercial HVAC unit, or a plumbing rough-in, the ZAC TOOL 21-ST5T delivers consistent, repeatable results. It is a reliable addition to any professional tool kit.

• Titanium coating for extended cutting life and reduced heat buildup
• 10 steps ranging from 1/4 inches to 1-3/8 inches for versatile hole sizing
• Compatible with standard drills and impact drivers via hex shank

Product Highlights

The ZAC TOOL 21-ST5T Titanium Step Drill covers 10 hole sizes from 1/4 inches to 1-3/8 inches in one bit, making it a practical everyday tool for electricians, HVAC techs, and plumbers working with sheet metal and thin-gauge materials.

Product Information

Standard Information

• Brand: ZAC TOOL
• Manufacturer Part Number: 21-ST5T

Technical Specifications

• Coating: Titanium
• Minimum Hole Size: 1/4 inches
• Maximum Hole Size: 1-3/8 inches
• Number of Steps: 10
• Case Quantity: 6