* A pair of Coupling Nuts and studs for extending the clamp set for top mounted clamping configuration. * Work with the standard clamp sets CS01. * Thread 5/16"-18 for table T slot size 3/8". * Thread 3/8"-16 for table T slot size 7/16" and 1/2". * Select the table T slot size from options for ordering * One pair of coupling nut can work for 2 pairs clamp sets