Product description Size: 11 inches Colour: Black Material: aluminum alloy Package content: 1*magic arm, 1*large crab claw clamp 1. Combination Durable Magic Arm Design. The adjustable magic arm with locking control knobs to release or enlarge the tension which can give all position movement as you want.Precise Adjustable Clamp:The precise mount provide great versatility for the positioning of access. 2. High Quality Superhard Metal Material:The ultra durable material guarantee the super steady and firm position of your device stand on it. 3. Useful 360 Degree Seivel Head:With a 360 swivel head at the end of the magic arm makes you a comfortable use when you need any angle of the device. 4. Easy Simplify Ergonomic Design:Ergonomic design with one knob locks all position, single Lock to all moving parts , easy to use for people of all ages. 5.Rubber cushion features a rubber cushion which could prevent the scratches of monitor and help to lock your accessories tighter.