Lowery Workstands Hoop ClampPrice: $94.95
This fully adjustable Hoop Clamp rotates 360 degrees, locking your work in place at any position.
This clamp attaches to the 'L' shaped part of the floor workstand and table clamp.
This clamp usually comes with the floor stand but if you have another workstand or table clamp without one, this is the piece you need.
Click the image above to see where it attaches to the floor stand.