MaterialMade of high quality rubber and Aluminum material with copper plated, eco-friendly, durable and sturdy to use. Adjustable glass circle cutterRound knob, suction cup holds center while the cutter wheel scribes circles. Easy to ReadThe lever has clear-cut scales which make easy to read. Compasses styleMax Circle Dia of cutting is 40cm. ApllicationPerfect for both hobbyists and professional glass cutters. Specification: Condition: 100% New Brand Color: Shown as picture Material: Rubber and Aluminum Total Length: Approx. 30cm / 11.8inch Suction Cup Dia.: Approx. 5.5cm / 2.2inch Lever Length: Approx. 20cm / 7.9" Max. Circle Dia.: Approx. 40cm / 15.7" Package Weight: Approx. 130g Package Included: 1 x Circle Glass Cutter