Durkee Freedom Ring Embroidery 4x4 Hoop No Thumbscrew No Magnets No Problem! A powerful, self-adjusting extension spring provides equal tension every time you hoop. A self-adjusting replacement outer hoop ring for your current Baby Lock or Brother 4 x 4 Hoop. Reduces, and often eliminates hoop burn caused by over tightening a thumbscrew. Elimination of the thumbscrew means no more wasted time adjusting the hoop for the fabric weight. No thumbscrew means less pain hooping for those with carpal tunnel syndrome or arthritic hands. Lifetime warranty on all plastic components.