General 55 Circle Cutter Tool 1-3/4 to 7-7/8 in Straight Shank

Product Description

The GENERAL 55 is a circle cutter tool designed to cut precise circular holes in a range of diameters. It accepts a 1/2-inch straight shank, making it compatible with standard drill presses and handheld drills. The adjustable cutting head spans a minimum cutting diameter of 1-3/4 inches up to a maximum of 7-7/8 inches, covering a wide range of hole sizes in a single tool. Electricians, HVAC technicians, plumbers, and general trades use circle cutters like the GENERAL 55 when cutting knockout holes in sheet metal panels, plastic enclosures, and similar materials. The tool weighs 0.188 pounds, keeping it light for repeated use.

The GENERAL 55 is suited for trade applications where consistent, clean circular cutouts are required. Typical uses include cutting holes in electrical junction boxes, HVAC duct panels, plastic junction covers, and light-gauge sheet materials. The adjustable range reduces the need for multiple hole saw sizes when working across different opening dimensions on the same job. Its straight shank design fits standard chuck sizes found on most drill presses and variable-speed drills used in the field.

Key Features

• Adjustable cutting diameter from 1-3/4 inches to 7-7/8 inches in a single tool
• 1/2-inch straight shank fits standard drill press and handheld drill chucks
• Lightweight at 0.188 pounds for reduced fatigue during repeated cuts
• No flatted shank — round straight shank design for straightforward chuck mounting
• Wide diameter range reduces the need to carry multiple hole saws

Compatibility

Designed for use with drill presses and handheld drills equipped with a 1/2-inch or larger chuck. Suitable for cutting holes in sheet metal, plastic panels, and similar light-gauge materials common in HVAC, electrical, and plumbing trade work.

Installation Notes

A licensed electrician, HVAC technician, or plumber should secure the workpiece firmly before beginning any cut to prevent spinning or shifting. Use a drill press where possible for cleaner, more controlled circular cuts, especially at larger diameters. Ensure the drill or press is powered off and the chuck is fully tightened before starting. When cutting sheet metal, wear appropriate eye and hand protection to guard against sharp edges and metal burrs.