Finally, a simple replacement for the tedious double-nut fitting on most hold-down toggle clamps! Change depth-of-pressure in seconds with the adjustable rubber foot, and for movement in-and-out along the arm just loosen a single set screw and adjust away. A comfortable locking knob caps it all off. Available in two sizes, 5/16" and 1/4", based on bolt-diameter. 5/16" adapter's inside dimension: 5/8" x 11/16". Inside dimension of 1/4 adapter: 9/16" x 9/16".
