Made of Quality tool steel, this exclusive design of speed guide circle cutter comes in various sizes and with various salient features. Available in MT2, MT3, R8 and Straight Shanks, which are hardened and precisely ground. Supplied with 1 Pc x hard & ground HSS cutting tool bit.Graduated scale showing the Circle Cutter Diameter readings for an easy setting & handy reference of our end users.Sturdy Setting of the Graduated scale & the HSS Cutting Bit by simply tightening the Allen screws provided along. Minimum Circle Diameter – 38 mm (1.5 Inches). Maximum Circle Diameter -165 mm (6.5 Inches), NOTE: The graduated scale is marked as per diameter, not the radius and is provided only for the reference of the user, not for exact precise measurement. So the user has to make trial for proper cutting diameter before actually cutting the sheet. Thanks