Essentials By Leisure Arts Spring Tension Hoops eliminate the need to tighten tiny screws. Simply lay your fabric over the outer hoop, give the handles of the inner hoop a squeeze and gently set it inside the inner hoop. Easy placement and release allows you to un-hoop stitchery when done for the day to reduce chance of hoop burn in your fabric and stitches. Low profile is also very useful for those doing free-hand embroidery and applique with the machine as this hoop fits nicely under the feeddogs. 5"- Composed of two parts, a plastic ring and a metal ring with a spring adjustment on it.