These clamps are designed to hold a hoop frame in a floor or table stand normally used for needlework scroll/lap frames.
Will hold a 25mm deep hoop (ie our Klas and Gessmann thick hoops)
Photo used here shows a 12" hoop frame in a deluxe floor stand. Can be used on any of our floor or table stands as these are all made by the same craftsman at HoDai Woodworks