BEST FOR HANDS FREE COMFORT - CLAMP SECURES TIGHT TO TABLETOPS, BEDS ETC . FLEXIBLE / ADJUSTABLE GOOSENECK. The strong, tight clamp is specially designed to be non-skid, so you can adjust the 13.5" neck without the head moving. Set and forget! Avoid uncomfortable glasses, headsets and headlamps! And use both hands, instead of a hand held magnifier.