Features 1、Made of high quality material, durable and sturdy to use. 2、Adjustable glass circle cutter, round knob, suction cup holds center while the cutter wheel scribes circles. 3、The lever has clear-cut scales which make easy to read. 4、Compasses style, comes with round knob handle that fits your hand. 5、Suitable for glass drawing circle, lampblack machine, air conditioning chimney opening, etc. Specification Features: Made of high quality material, durable and sturdy to use. Adjustable glass circle cutter, round knob, suction cup holds center while the cutter wheel scribes circles. The lever has clear-cut scales which make easy to read. Compasses style, comes with round knob handle that fits your hand. Suitable for glass drawing circle, lampblack machine, air conditioning chimney opening, etc. Specification: Cutting thickness: 3~12mm Diameter: 20cm/7.9in, 40cm/15.7in, 60cm/23.6in, 80cm/31.5in (Optional) Package List: 1 x Glass Cutter Package List