Magnetic Hoops for Smartstitch S1001 S1201 Embroidery Machine Model OnlyThe hoop sizes refer to the inner hoop dimension for example, 3. 9x3. 9(100x100mm) refers to the inner hoop dimension. The actual sewing field is about 3. 1x3. 1(75x75mm), depending on the machine brand and model. For Use With The Smartstitch Machines Smartstitch S1501 Machine Packing List 1. Hoop Main Part x 1 pcs 2. Metal Brackets x 1 pair 3. Screws & Screwdriver (Note: Brackets will be matched according to your machine brand, and need to be