The inside dimension of this hoop is 5 5/16″ (5.30″, or 135mm)
Actual sewing area is approximately 4 5/16″ to 4 13/16″ (110 to 122mm)
Fits: Brother PR Series 1 needle, 6 needle, and 10 needle embroidery machines including Brother PRS100 Embroidery Machines and Brother PR1055X Multi Needle Embroidery Machines.