The Q-Snap clamp accommodates Q-Snap frames from 8″ to 17″ and includes one arm for extension. The Q-Snap Clamp is combined with the Floor Stand, Table Clamp, Travel-Mate, or the Lap/Table Stand. See our separate listings for the range of NS4 Stands. Please note that 17″ is the largest spread available for the Q-Snap Clamp by Needlework System 4. Larger sizes have been tested but have been found to be unstable.