Product Description Master your jobs with speed and accuracy with the Greenlee 1-1/8" Quick-Change Carbide-Tipped Hole Cutter (catalog number 645-1-1/8). Designed for plumbing experts, this carbide hole cutter produces round, burr-free holes for 3/4" conduit including stainless steel, mild steel, aluminum, brass, fiberglass, and plastics. The tungsten carbide teeth are optimized for fast, easy hole cutting and long-lasting durability in stainless steel applications with no oil required. With a simple push and turn connection, you can quickly switch between cutter sizes without re-chucking to make the most of your time on the job, and the replaceable split-point cobalt steel pilot drill with a step design allows for quick, accurate metal cutting while requiring less force from the user. The flange stop conveniently prevents over-drilling for a super performance every time, and the slug ejector spring allows you to quickly and easily remove slugs. Greenlee: Professional. Nothing Less.™ From the Manufacturer Greenlee's quick change stainless steel hole cutters cut stainless steel quickly and easily. The quick change arbor allows you to change cutter heads with a simple push and a turn. Uses the same arbor for different size cutting heads. Removable cutter heads are available in sizes from 5/8-Inch through 3-Inch. Flange stop prevents over-drilling. Ejector spring on all sizes above 3/4-Inch makes removal of slug easier. Replaceable, cobalt-steel pilot drill with split-point tip to prevent walking. Precision carbide teeth for optimum performance and durability. Minimum chuck size of 3/8-Inch.