Designed for professional use, the Heavy Duty Assorts' Adjustable & Sturdy Circle Cutter Cutting Diameter 1-3/16" (30 mm) to 6-1/2" Inches (165 mm) Range The Straight parallel holding shank is 12 mm which could be easily held through a drill chuck in your machine. Smooth sliding movement, easy to calibrate and use. Maximum recommended safe speed is 500 RPM This round shank circle cutter is great for making smooth cuts through most materials, including wood, composite, sheet metal and more. All adjustments are made with a hex wrench which is included. A HSS tool bit is included as shown in the picture. The drill is not included in the offer, pls note. Epoxy black finish for a long rust free life.