Greenlee 721-3/4 Round Slug-Buster Knockout Punch, 3/4" Conduit Size

Greenlee 721-3/4 Round Slug-Buster Knockout Punch, 3/4" Conduit Size

The Greenlee 721-3/4 is a 3/4" conduit size round Slug-Buster replacement punch built for electricians and panel fabricators who need fast, accurate knockouts in mild steel enclosures and panels. This punch produces an actual hole size of 1.115 IN (28.300 MM) and is rated for capacities up to 10 GA (3.500 MM) mild steel, making it a dependable choice for professional panel and box fabrication work. Alignment markings on the punch body help installers position the tool precisely, improving punching accuracy and reducing wasted material on every job. As a genuine Greenlee replacement component, the 721-3/4 is designed to integrate with compatible Slug-Buster punch driver systems, giving crews a reliable way to keep their knockout tooling in service without replacing an entire punch set. Panel shops, electrical contractors, and maintenance crews rely on this style of replacement punch to extend the service life of their existing Slug-Buster sets, avoiding the cost of a full tooling replacement when only a single punch wears out or is damaged on site.

Key Features

• Trade Size: 3/4" conduit size round punch for standard electrical knockout applications.
• Actual Hole Size: Produces a precise 1.115 IN (28.300 MM) opening for consistent, code-ready knockouts.
• Steel Capacity: Rated to punch mild steel up to 10 GA (3.500 MM) thickness for durable panel and enclosure work.
• Alignment Markings: Etched markings improve punching accuracy and productivity when making holes on the job site.
• Clear Part Identification: Punches and dies are marked with catalog numbers and sizes for quick, error-free part identification in the field.
• Replacement Component: Designed as a Slug-Buster replacement punch, allowing crews to service existing punch sets rather than replace them entirely.
• Made in the USA: Manufactured in the United States to Greenlee's quality standards for professional electrical tooling.

Technical Specifications

• Application: Slug-Buster 3/4" Conduit Size Replacement Punch
• Capacity Mild Steel: 10 GA (3.500 MM)
• Product Size: 1.115 IN (28.300 MM) Actual Hole Size
• Product Type: Replacement, Round
• Product Subgroup: Knockout Punches

Typical Applications

• Electrical Panel and Enclosure Fabrication
• Conduit Entry Knockout Punching in Mild Steel
• Replacement Tooling for Existing Slug-Buster Punch Sets
• Commercial and Industrial Electrical Installation Work
• Panel Shop and Field Modification Projects

Why Greenlee?

Greenlee builds its Slug-Buster punches with alignment markings and clear catalog number identification so electricians can work faster and more accurately on every knockout. Rated for 10 GA mild steel and manufactured in the USA, the 721-3/4 replacement punch delivers the consistent 1.115 IN hole size professionals depend on for reliable, code-compliant panel fabrication. Choosing genuine Greenlee replacement punches like the 721-3/4 helps ensure compatibility with existing Slug-Buster driver systems and keeps knockout tooling performing to the same standard as the original set, job after job.