1.RAZOR SHARP BLADE - Our cutter is preloaded with a COB-1 Compass Circle Cutter Blade made from high-quality carbon tool steel for unparalleled sharpness and superior edge retention. The blades allow you to work longer uninterrupted. 2.ADJUSTABLE CIRCLE DIAMETER - The cutter has an adjustable slide mechanism that easily changes the circle diameter you wish to cut. You're able to cut circles up to 6 inches in diameter with this tool. 3.TOOL FREE BLADE REPLACEMENT - The circle cutter provides and easy tool- blade replacement. When the cutting edge becomes dull, the screw-fixed blade can be removed and replaced by untightening the large knurled knob. You can switch from right to left-hand use with this also. 4.MAKES PERFECT CIRCLES - Our cutter is designed for crafts, model building, photography, scrapbooks, sign making, and more. It's great at cutting paper, vinyl, leather, film, fabric, acetates, cardboard, light wood, and more.