With its particularly firm hold, the embroidery hoop guarantees limitless embroidery fun! The ring is grooved from the inside. This means that the inner ring is provided with a narrow thickening all around, which "snaps" into the groove of the outer ring. As a result, the embroidery grounds have a firm hold and do not slip. Clamping works very easily if the metal screw is completely loosened: simply place the outer ring around the inner ring and then tighten the screw again.