1.DURABLE MATERIALS: This circle drawing maker is made of excellent aluminum alloy and 304 stainless steel material, odorless, non toxic, durable, not easy to corrosion, rust, deform or damage 2.PACKAGE INCLUDE: You will receive 1 aluminum alloy round form and 1 carving knife, the diameter of the form is about 12.5cm/4.92 inches, small and portable, easy to carry and store 3.EXTENDED DESIGN: The perimeter of the adjustable circle drawing tool can be enlarged or reduced, and simply rotate the ring to open and close the charming aperture mechanism for drawing circular measurements 4.SIMPLE OPERATION: You can simply place the ring circle making tool where you want, adjust the size of the center circle to suit your needs by rotating the gold edge, and then draw along the circle with a pen 5.APPLICABLE SCENARIO: Circle drawing maker tool is easy to apply, suitable for your daily use, can be used for woodworking, DIY, etc.