[2 in 1] Includes 6 replacement chips and 2 pencil leads. Use pencil lead instead of a blade which can be used as a compass or a round knife. [Precise and fast cutting] You can cut all types of circles with diameters from 10 mm to 150 mm. You can also remove the blade and replace it with a pen holder for universal compass use. [Elaborate design] Including built-in blade protection cover, which can be used safely; the plastic protective cover can cover the rotating nails when not in use; Ratchet handle design can reduce wrist fatigue and is suitable for left and right hands. [High-quality material] The main body is made of strong, lightweight and high-strength plastic. The adjustment screw is a solid brass piece.